21966280900 has 18 divisors (see below), whose sum is σ = 47666829770. Its totient is φ = 8786512320.

The previous prime is 21966280891. The next prime is 21966280933. The reversal of 21966280900 is 908266912.

It can be written as a sum of positive squares in 3 ways, for example, as 3380957316 + 18585323584 = 58146^2 + 136328^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109831305 + ... + 109831504.

Almost surely, 2^21966280900 is an apocalyptic number.

21966280900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21966280900 is an abundant number, since it is smaller than the sum of its proper divisors (25700548870).

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

21966280900 is a wasteful number, since it uses less digits than its factorization.

21966280900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219662823 (or 219662816 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 21966280900 in words is "twenty-one billion, nine hundred sixty-six million, two hundred eighty thousand, nine hundred".