231020111010221 has 32 divisors (see below), whose sum is σ = 258771152424960. Its totient is φ = 204805434758400.

The previous prime is 231020111010211. The next prime is 231020111010229. The reversal of 231020111010221 is 122010111020132.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231020111010221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231020111010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231020111010229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24127811 + ... + 32313951.

It is an arithmetic number, because the mean of its divisors is an integer number (8086598513280).

Almost surely, 2^{231020111010221} is an apocalyptic number.

It is an amenable number.

231020111010221 is a deficient number, since it is larger than the sum of its proper divisors (27751041414739).

231020111010221 is a wasteful number, since it uses less digits than its factorization.

231020111010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8186717.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 231020111010221 its reverse (122010111020132), we get a palindrome (353030222030353).

The spelling of 231020111010221 in words is "two hundred thirty-one trillion, twenty billion, one hundred eleven million, ten thousand, two hundred twenty-one".