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BaseRepresentation
bin1010111010100011111101…
…0100101110010100001101
31120111022012100000100112221
42232220333110232110031
53033111424430202341
641305135312055341
72346025643356015
oct256507724562415
946438170010487
1012001201022221
113907754119654
121419ab5b34551
13690929481418
142d6c0b2d6c45
hexaea3f52e50d

12001201022221 has 4 divisors (see below), whose sum is σ = 12039790093344. Its totient is φ = 11962611951100.

The previous prime is 12001201022191. The next prime is 12001201022227. The reversal of 12001201022221 is 12222010210021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12001201022221 - 27 = 12001201022093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001201022195 and 12001201022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001201022227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19294535095 + ... + 19294535716.

It is an arithmetic number, because the mean of its divisors is an integer number (3009947523336).

Almost surely, 212001201022221 is an apocalyptic number.

It is an amenable number.

12001201022221 is a deficient number, since it is larger than the sum of its proper divisors (38589071123).

12001201022221 is an equidigital number, since it uses as much as digits as its factorization.

12001201022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38589071122.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12001201022221 its reverse (12222010210021), we get a palindrome (24223211232242).

The spelling of 12001201022221 in words is "twelve trillion, one billion, two hundred one million, twenty-two thousand, two hundred twenty-one".

Divisors: 1 311 38589070811 12001201022221