21021302020 has 48 divisors (see below), whose sum is σ = 45247362048. Its totient is φ = 8200400000.

The previous prime is 21021302011. The next prime is 21021302039. The reversal of 21021302020 is 2020312012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117645 + ... + 236395.

It is an arithmetic number, because the mean of its divisors is an integer number (942653376).

Almost surely, 2^21021302020 is an apocalyptic number.

21021302020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021302020 is an abundant number, since it is smaller than the sum of its proper divisors (24226060028).

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

21021302020 is a wasteful number, since it uses less digits than its factorization.

21021302020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118980 (or 118978 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21021302020 its reverse (2020312012), we get a palindrome (23041614032).

The spelling of 21021302020 in words is "twenty-one billion, twenty-one million, three hundred two thousand, twenty".