21966261632 has 64 divisors (see below), whose sum is σ = 50035806240. Its totient is φ = 9409720320.

The previous prime is 21966261631. The next prime is 21966261649. The reversal of 21966261632 is 23616266912.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21966261631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2555582 + ... + 2564162.

Almost surely, 2^21966261632 is an apocalyptic number.

It is an amenable number.

21966261632 is an abundant number, since it is smaller than the sum of its proper divisors (28069544608).

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

21966261632 is an equidigital number, since it uses as much as digits as its factorization.

21966261632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11459 (or 11447 counting only the distinct ones).

The product of its digits is 279936, while the sum is 44.

The spelling of 21966261632 in words is "twenty-one billion, nine hundred sixty-six million, two hundred sixty-one thousand, six hundred thirty-two".