21131020330 has 64 divisors (see below), whose sum is σ = 44085888000. Its totient is φ = 7142473728.

The previous prime is 21131020303. The next prime is 21131020343. The reversal of 21131020330 is 3302013112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4250086 + ... + 4255054.

It is an arithmetic number, because the mean of its divisors is an integer number (688842000).

Almost surely, 2^21131020330 is an apocalyptic number.

21131020330 is an abundant number, since it is smaller than the sum of its proper divisors (22954867670).

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

21131020330 is a wasteful number, since it uses less digits than its factorization.

21131020330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5831.

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

Adding to 21131020330 its reverse (3302013112), we get a palindrome (24433033442).

The spelling of 21131020330 in words is "twenty-one billion, one hundred thirty-one million, twenty thousand, three hundred thirty".