21661020450632 has 64 divisors (see below), whose sum is σ = 44101418251200. Its totient is φ = 9941647415040.

The previous prime is 21661020450577. The next prime is 21661020450679. The reversal of 21661020450632 is 23605402016612.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16812923 + ... + 18055370.

It is an arithmetic number, because the mean of its divisors is an integer number (689084660175).

Almost surely, 2^{21661020450632} is an apocalyptic number.

It is an amenable number.

21661020450632 is an abundant number, since it is smaller than the sum of its proper divisors (22440397800568).

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

21661020450632 is a wasteful number, since it uses less digits than its factorization.

21661020450632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34868446 (or 34868442 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21661020450632 in words is "twenty-one trillion, six hundred sixty-one billion, twenty million, four hundred fifty thousand, six hundred thirty-two".