21203020332 has 72 divisors (see below), whose sum is σ = 58173979136. Its totient is φ = 6472617984.

The previous prime is 21203020297. The next prime is 21203020339. The reversal of 21203020332 is 23302030212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21203020339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118933 + ... + 237804.

Almost surely, 2^21203020332 is an apocalyptic number.

It is an amenable number.

21203020332 is an abundant number, since it is smaller than the sum of its proper divisors (36970958804).

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

21203020332 is a wasteful number, since it uses less digits than its factorization.

21203020332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356887 (or 356882 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21203020332 its reverse (23302030212), we get a palindrome (44505050544).

The spelling of 21203020332 in words is "twenty-one billion, two hundred three million, twenty thousand, three hundred thirty-two".