21230123312021 has 16 divisors (see below), whose sum is σ = 24067127797440. Its totient is φ = 18565157802240.

The previous prime is 21230123311939. The next prime is 21230123312089. The reversal of 21230123312021 is 12021332103212.

It is a cyclic number.

It is not a de Polignac number, because 21230123312021 - 2²² = 21230119117717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230123315021) 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, 9220646 + ... + 11290728.

It is an arithmetic number, because the mean of its divisors is an integer number (1504195487340).

Almost surely, 2^{21230123312021} is an apocalyptic number.

It is an amenable number.

21230123312021 is a deficient number, since it is larger than the sum of its proper divisors (2837004485419).

21230123312021 is a wasteful number, since it uses less digits than its factorization.

21230123312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111636.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21230123312021 its reverse (12021332103212), we get a palindrome (33251455415233).

The spelling of 21230123312021 in words is "twenty-one trillion, two hundred thirty billion, one hundred twenty-three million, three hundred twelve thousand, twenty-one".