21616010620 has 12 divisors (see below), whose sum is σ = 45393622344. Its totient is φ = 8646404240.

The previous prime is 21616010617. The next prime is 21616010651. The reversal of 21616010620 is 2601061612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540400246 + ... + 540400285.

It is an arithmetic number, because the mean of its divisors is an integer number (3782801862).

Almost surely, 2^21616010620 is an apocalyptic number.

21616010620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21616010620 is an abundant number, since it is smaller than the sum of its proper divisors (23777611724).

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

21616010620 is a wasteful number, since it uses less digits than its factorization.

21616010620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080800540 (or 1080800538 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21616010620 in words is "twenty-one billion, six hundred sixteen million, ten thousand, six hundred twenty".