1001211012221 has 4 divisors (see below), whose sum is σ = 1144241156832. Its totient is φ = 858180867612.

The previous prime is 1001211012149. The next prime is 1001211012229. The reversal of 1001211012221 is 1222101121001.

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 a de Polignac number, because none of the positive numbers 2^k-1001211012221 is a prime.

It is a super-2 number, since 2×1001211012221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001211012196 and 1001211012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211012229) 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, 71515072295 + ... + 71515072308.

It is an arithmetic number, because the mean of its divisors is an integer number (286060289208).

Almost surely, 2^{1001211012221} is an apocalyptic number.

It is an amenable number.

1001211012221 is a deficient number, since it is larger than the sum of its proper divisors (143030144611).

1001211012221 is an equidigital number, since it uses as much as digits as its factorization.

1001211012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143030144610.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001211012221 its reverse (1222101121001), we get a palindrome (2223312133222).

The spelling of 1001211012221 in words is "one trillion, one billion, two hundred eleven million, twelve thousand, two hundred twenty-one".