21213610641626 has 64 divisors (see below), whose sum is σ = 35964305233920. Its totient is φ = 9311208223680.

The previous prime is 21213610641581. The next prime is 21213610641631. The reversal of 21213610641626 is 62614601631212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 735471161 + ... + 735500003.

It is an arithmetic number, because the mean of its divisors is an integer number (561942269280).

Almost surely, 2^{21213610641626} is an apocalyptic number.

21213610641626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21213610641626 is a deficient number, since it is larger than the sum of its proper divisors (14750694592294).

21213610641626 is a wasteful number, since it uses less digits than its factorization.

21213610641626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35931.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21213610641626 in words is "twenty-one trillion, two hundred thirteen billion, six hundred ten million, six hundred forty-one thousand, six hundred twenty-six".