21630030640 has 40 divisors (see below), whose sum is σ = 50570803440. Its totient is φ = 8603671296.

The previous prime is 21630030607. The next prime is 21630030689. The reversal of 21630030640 is 4603003612.

It is a tau number, because it is divible by the number of its divisors (40).

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, 740919 + ... + 769558.

It is an arithmetic number, because the mean of its divisors is an integer number (1264270086).

Almost surely, 2^21630030640 is an apocalyptic number.

21630030640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21630030640 is an abundant number, since it is smaller than the sum of its proper divisors (28940772800).

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

21630030640 is a wasteful number, since it uses less digits than its factorization.

21630030640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510669 (or 1510663 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The spelling of 21630030640 in words is "twenty-one billion, six hundred thirty million, thirty thousand, six hundred forty".