21007626620 has 48 divisors (see below), whose sum is σ = 44575684608. Its totient is φ = 8315611200.

The previous prime is 21007626599. The next prime is 21007626643. The reversal of 21007626620 is 2662670012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4016447 + ... + 4021673.

It is an arithmetic number, because the mean of its divisors is an integer number (928660096).

Almost surely, 2^21007626620 is an apocalyptic number.

21007626620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21007626620 is an abundant number, since it is smaller than the sum of its proper divisors (23568057988).

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

21007626620 is a wasteful number, since it uses less digits than its factorization.

21007626620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7290 (or 7288 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 21007626620 in words is "twenty-one billion, seven million, six hundred twenty-six thousand, six hundred twenty".