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12311421 = 34103807
BaseRepresentation
bin101110111101…
…101101111101
3212011111002120
4232331231331
511122431141
61115513153
7206434233
oct56755575
925144076
1012311421
116a49831
1241587b9
132720985
1418c6953
151132c66
hexbbdb7d

12311421 has 4 divisors (see below), whose sum is σ = 16415232. Its totient is φ = 8207612.

The previous prime is 12311419. The next prime is 12311443. The reversal of 12311421 is 12411321.

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 12311421 - 21 = 12311419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12311421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311401) 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, 2051901 + ... + 2051906.

It is an arithmetic number, because the mean of its divisors is an integer number (4103808).

Almost surely, 212311421 is an apocalyptic number.

It is an amenable number.

12311421 is a deficient number, since it is larger than the sum of its proper divisors (4103811).

12311421 is an equidigital number, since it uses as much as digits as its factorization.

12311421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103810.

The product of its digits is 48, while the sum is 15.

The square root of 12311421 is about 3508.7634574021. The cubic root of 12311421 is about 230.9064481283.

Adding to 12311421 its reverse (12411321), we get a palindrome (24722742).

The spelling of 12311421 in words is "twelve million, three hundred eleven thousand, four hundred twenty-one".

Divisors: 1 3 4103807 12311421