21621124452023 has 16 divisors (see below), whose sum is σ = 23948461620000. Its totient is φ = 19426834301952.

The previous prime is 21621124452001. The next prime is 21621124452047. The reversal of 21621124452023 is 32025442112612.

It is a cyclic number.

It is not a de Polignac number, because 21621124452023 - 2¹² = 21621124447927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621124452223) 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, 246339473 + ... + 246427226.

It is an arithmetic number, because the mean of its divisors is an integer number (1496778851250).

Almost surely, 2^{21621124452023} is an apocalyptic number.

21621124452023 is a deficient number, since it is larger than the sum of its proper divisors (2327337167977).

21621124452023 is a wasteful number, since it uses less digits than its factorization.

21621124452023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492766834.

The product of its (nonzero) digits is 46080, while the sum is 35.

Adding to 21621124452023 its reverse (32025442112612), we get a palindrome (53646566564635).

The spelling of 21621124452023 in words is "twenty-one trillion, six hundred twenty-one billion, one hundred twenty-four million, four hundred fifty-two thousand, twenty-three".