21020013332 has 48 divisors (see below), whose sum is σ = 38106163200. Its totient is φ = 10138867200.

The previous prime is 21020013277. The next prime is 21020013337. The reversal of 21020013332 is 23331002012.

It is a self number, because there is not a number n which added to its sum of digits gives 21020013332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020013337) 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, 6892544 + ... + 6895592.

It is an arithmetic number, because the mean of its divisors is an integer number (793878400).

Almost surely, 2^21020013332 is an apocalyptic number.

It is an amenable number.

21020013332 is a deficient number, since it is larger than the sum of its proper divisors (17086149868).

21020013332 is a wasteful number, since it uses less digits than its factorization.

21020013332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552 (or 3550 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21020013332 its reverse (23331002012), we get a palindrome (44351015344).

The spelling of 21020013332 in words is "twenty-one billion, twenty million, thirteen thousand, three hundred thirty-two".