21626661052600 has 48 divisors (see below), whose sum is σ = 50649008814000. Its totient is φ = 8587520874240.

The previous prime is 21626661052589. The next prime is 21626661052603. The reversal of 21626661052600 is 625016662612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21626661052603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 394619700 + ... + 394674499.

It is an arithmetic number, because the mean of its divisors is an integer number (1055187683625).

Almost surely, 2^{21626661052600} is an apocalyptic number.

21626661052600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21626661052600 is an abundant number, since it is smaller than the sum of its proper divisors (29022347761400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21626661052600 is a wasteful number, since it uses less digits than its factorization.

21626661052600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789294352 (or 789294343 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 21626661052600 in words is "twenty-one trillion, six hundred twenty-six billion, six hundred sixty-one million, fifty-two thousand, six hundred".