21332311209 has 12 divisors (see below), whose sum is σ = 33614551152. Its totient is φ = 12928673400.

The previous prime is 21332311207. The next prime is 21332311219. The reversal of 21332311209 is 90211323312.

21332311209 is a `hidden beast` number, since 213 + 323 + 1 + 120 + 9 = 666.

It is not a de Polignac number, because 21332311209 - 2¹ = 21332311207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21332311207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107738847 + ... + 107739044.

It is an arithmetic number, because the mean of its divisors is an integer number (2801212596).

Almost surely, 2^21332311209 is an apocalyptic number.

It is an amenable number.

21332311209 is a deficient number, since it is larger than the sum of its proper divisors (12282239943).

21332311209 is a wasteful number, since it uses less digits than its factorization.

21332311209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215477908 (or 215477905 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The spelling of 21332311209 in words is "twenty-one billion, three hundred thirty-two million, three hundred eleven thousand, two hundred nine".