21215043755626 has 16 divisors (see below), whose sum is σ = 36369275707584. Its totient is φ = 9092004292224.

The previous prime is 21215043755527. The next prime is 21215043755669. The reversal of 21215043755626 is 62655734051212.

It is a self number, because there is not a number n which added to its sum of digits gives 21215043755626.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12269895 + ... + 13891738.

It is an arithmetic number, because the mean of its divisors is an integer number (2273079731724).

Almost surely, 2^{21215043755626} is an apocalyptic number.

21215043755626 is a deficient number, since it is larger than the sum of its proper divisors (15154231951958).

21215043755626 is a wasteful number, since it uses less digits than its factorization.

21215043755626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26219565.

The product of its (nonzero) digits is 3024000, while the sum is 49.

The spelling of 21215043755626 in words is "twenty-one trillion, two hundred fifteen billion, forty-three million, seven hundred fifty-five thousand, six hundred twenty-six".