21020020332 has 48 divisors (see below), whose sum is σ = 51322478592. Its totient is φ = 6687757440.

The previous prime is 21020020319. The next prime is 21020020337. The reversal of 21020020332 is 23302002012.

It is not an unprimeable number, because it can be changed into a prime (21020020337) 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, 359868 + ... + 414179.

It is an arithmetic number, because the mean of its divisors is an integer number (1069218304).

Almost surely, 2^21020020332 is an apocalyptic number.

It is an amenable number.

21020020332 is an abundant number, since it is smaller than the sum of its proper divisors (30302458260).

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

21020020332 is a wasteful number, since it uses less digits than its factorization.

21020020332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774158 (or 774156 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21020020332 its reverse (23302002012), we get a palindrome (44322022344).

The spelling of 21020020332 in words is "twenty-one billion, twenty million, twenty thousand, three hundred thirty-two".