21330021992 has 16 divisors (see below), whose sum is σ = 42346367460. Its totient is φ = 10037657344.

The previous prime is 21330021991. The next prime is 21330022013. The reversal of 21330021992 is 29912003312.

It can be written as a sum of positive squares in 2 ways, for example, as 19456344196 + 1873677796 = 139486^2 + 43286^2 .

It is not an unprimeable number, because it can be changed into a prime (21330021991) 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, 78419063 + ... + 78419334.

Almost surely, 2^21330021992 is an apocalyptic number.

It is an amenable number.

21330021992 is a deficient number, since it is larger than the sum of its proper divisors (21016345468).

21330021992 is a wasteful number, since it uses less digits than its factorization.

21330021992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156838420 (or 156838416 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The spelling of 21330021992 in words is "twenty-one billion, three hundred thirty million, twenty-one thousand, nine hundred ninety-two".