21616543626510 has 64 divisors (see below), whose sum is σ = 59291463002112. Its totient is φ = 4940893264896.

The previous prime is 21616543626487. The next prime is 21616543626529. The reversal of 21616543626510 is 1562634561612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21616543626510.

It is a congruent number.

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, 60075294 + ... + 60434046.

It is an arithmetic number, because the mean of its divisors is an integer number (926429109408).

Almost surely, 2^{21616543626510} is an apocalyptic number.

21616543626510 is an abundant number, since it is smaller than the sum of its proper divisors (37674919375602).

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

21616543626510 is a wasteful number, since it uses less digits than its factorization.

21616543626510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645697.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 21616543626510 in words is "twenty-one trillion, six hundred sixteen billion, five hundred forty-three million, six hundred twenty-six thousand, five hundred ten".