21330131020 has 48 divisors (see below), whose sum is σ = 49217011200. Its totient is φ = 7700598720.

The previous prime is 21330131003. The next prime is 21330131021. The reversal of 21330131020 is 2013103312.

It is a junction number, because it is equal to n+sod(n) for n = 21330130985 and 21330131003.

It is not an unprimeable number, because it can be changed into a prime (21330131021) 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, 318180 + ... + 379339.

It is an arithmetic number, because the mean of its divisors is an integer number (1025354400).

Almost surely, 2^21330131020 is an apocalyptic number.

21330131020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330131020 is an abundant number, since it is smaller than the sum of its proper divisors (27886880180).

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

21330131020 is a wasteful number, since it uses less digits than its factorization.

21330131020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697678 (or 697676 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21330131020 its reverse (2013103312), we get a palindrome (23343234332).

The spelling of 21330131020 in words is "twenty-one billion, three hundred thirty million, one hundred thirty-one thousand, twenty".