21516662000 has 80 divisors (see below), whose sum is σ = 55087804512. Its totient is φ = 8100377600.

The previous prime is 21516661997. The next prime is 21516662009. The reversal of 21516662000 is 26661512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516662009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282422 + ... + 350421.

Almost surely, 2^21516662000 is an apocalyptic number.

21516662000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21516662000 is an abundant number, since it is smaller than the sum of its proper divisors (33571142512).

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

21516662000 is a wasteful number, since it uses less digits than its factorization.

21516662000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632883 (or 632867 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21516662000 in words is "twenty-one billion, five hundred sixteen million, six hundred sixty-two thousand".