21303573966 has 40 divisors (see below), whose sum is σ = 47763147960. Its totient is φ = 7097121072.

The previous prime is 21303573899. The next prime is 21303573989. The reversal of 21303573966 is 66937530312.

21303573966 is a `hidden beast` number, since 2 + 13 + 0 + 3 + 573 + 9 + 66 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 252700 + ... + 326288.

It is an arithmetic number, because the mean of its divisors is an integer number (1194078699).

Almost surely, 2^21303573966 is an apocalyptic number.

21303573966 is an abundant number, since it is smaller than the sum of its proper divisors (26459573994).

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

21303573966 is a wasteful number, since it uses less digits than its factorization.

21303573966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75390 (or 75381 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 45.

The spelling of 21303573966 in words is "twenty-one billion, three hundred three million, five hundred seventy-three thousand, nine hundred sixty-six".