21652431042621 has 16 divisors (see below), whose sum is σ = 28883176058880. Its totient is φ = 14428320729840.

The previous prime is 21652431042611. The next prime is 21652431042653. The reversal of 21652431042621 is 12624013425612.

It is not a de Polignac number, because 21652431042621 - 2¹⁰ = 21652431041597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21652431042621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652431042611) 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, 140123320 + ... + 140277758.

It is an arithmetic number, because the mean of its divisors is an integer number (1805198503680).

Almost surely, 2^{21652431042621} is an apocalyptic number.

It is an amenable number.

21652431042621 is a deficient number, since it is larger than the sum of its proper divisors (7230745016259).

21652431042621 is a wasteful number, since it uses less digits than its factorization.

21652431042621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175616.

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 21652431042621 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred thirty-one million, forty-two thousand, six hundred twenty-one".