231021102212221 has 16 divisors (see below), whose sum is σ = 232957010563200. Its totient is φ = 229093468950528.

The previous prime is 231021102212179. The next prime is 231021102212261. The reversal of 231021102212221 is 122212201120132.

It is a cyclic number.

It is not a de Polignac number, because 231021102212221 - 2⁹ = 231021102211709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231021102212192 and 231021102212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231021102212261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134247525 + ... + 135957493.

It is an arithmetic number, because the mean of its divisors is an integer number (14559813160200).

Almost surely, 2^{231021102212221} is an apocalyptic number.

It is an amenable number.

231021102212221 is a deficient number, since it is larger than the sum of its proper divisors (1935908350979).

231021102212221 is a wasteful number, since it uses less digits than its factorization.

231021102212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712388.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 231021102212221 its reverse (122212201120132), we get a palindrome (353233303332353).

The spelling of 231021102212221 in words is "two hundred thirty-one trillion, twenty-one billion, one hundred two million, two hundred twelve thousand, two hundred twenty-one".