21666463032 has 16 divisors (see below), whose sum is σ = 54166157640. Its totient is φ = 7222154336.

The previous prime is 21666463003. The next prime is 21666463037. The reversal of 21666463032 is 23036466612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21666463037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451384623 + ... + 451384670.

Almost surely, 2^21666463032 is an apocalyptic number.

It is an amenable number.

21666463032 is an abundant number, since it is smaller than the sum of its proper divisors (32499694608).

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

21666463032 is a wasteful number, since it uses less digits than its factorization.

21666463032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902769302 (or 902769298 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 39.

The spelling of 21666463032 in words is "twenty-one billion, six hundred sixty-six million, four hundred sixty-three thousand, thirty-two".