21626510055663 has 8 divisors (see below), whose sum is σ = 28835371994800. Its totient is φ = 14417660743488.

The previous prime is 21626510055629. The next prime is 21626510055737. The reversal of 21626510055663 is 36655001562612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21626510055663 - 2⁶ = 21626510055599 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 (21626510055463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2081253 + ... + 6898161.

It is an arithmetic number, because the mean of its divisors is an integer number (3604421499350).

Almost surely, 2^{21626510055663} is an apocalyptic number.

21626510055663 is a deficient number, since it is larger than the sum of its proper divisors (7208861939137).

21626510055663 is a wasteful number, since it uses less digits than its factorization.

21626510055663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6313481.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 21626510055663 in words is "twenty-one trillion, six hundred twenty-six billion, five hundred ten million, fifty-five thousand, six hundred sixty-three".