21869529966 has 24 divisors (see below), whose sum is σ = 47387011464. Its totient is φ = 7289377200.

The previous prime is 21869529959. The next prime is 21869529977. The reversal of 21869529966 is 66992596812.

21869529966 is a `hidden beast` number, since 2 + 18 + 6 + 9 + 529 + 96 + 6 = 666.

It is a super-2 number, since 2×21869529966² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 362625 + ... + 418611.

It is an arithmetic number, because the mean of its divisors is an integer number (1974458811).

Almost surely, 2^21869529966 is an apocalyptic number.

21869529966 is an abundant number, since it is smaller than the sum of its proper divisors (25517481498).

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

21869529966 is a wasteful number, since it uses less digits than its factorization.

21869529966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77696 (or 77693 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 63.

The spelling of 21869529966 in words is "twenty-one billion, eight hundred sixty-nine million, five hundred twenty-nine thousand, nine hundred sixty-six".