21393664060 has 12 divisors (see below), whose sum is σ = 44926694568. Its totient is φ = 8557465616.

The previous prime is 21393664051. The next prime is 21393664081. The reversal of 21393664060 is 6046639312.

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, 534841582 + ... + 534841621.

It is an arithmetic number, because the mean of its divisors is an integer number (3743891214).

Almost surely, 2^21393664060 is an apocalyptic number.

21393664060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21393664060 is an abundant number, since it is smaller than the sum of its proper divisors (23533030508).

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

21393664060 is a wasteful number, since it uses less digits than its factorization.

21393664060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069683212 (or 1069683210 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 40.

The spelling of 21393664060 in words is "twenty-one billion, three hundred ninety-three million, six hundred sixty-four thousand, sixty".