21332607961 has 16 divisors (see below), whose sum is σ = 24919622784. Its totient is φ = 17882676864.

The previous prime is 21332607953. The next prime is 21332607973. The reversal of 21332607961 is 16970623312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21332607961 - 2³ = 21332607953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21332607931) 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, 24270 + ... + 207976.

It is an arithmetic number, because the mean of its divisors is an integer number (1557476424).

Almost surely, 2^21332607961 is an apocalyptic number.

It is an amenable number.

21332607961 is a deficient number, since it is larger than the sum of its proper divisors (3587014823).

21332607961 is a wasteful number, since it uses less digits than its factorization.

21332607961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184080.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 21332607961 in words is "twenty-one billion, three hundred thirty-two million, six hundred seven thousand, nine hundred sixty-one".