21020311130 has 64 divisors (see below), whose sum is σ = 49307408640. Its totient is φ = 6261249024.

The previous prime is 21020311127. The next prime is 21020311153. The reversal of 21020311130 is 3111302012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 663920 + ... + 694859.

It is an arithmetic number, because the mean of its divisors is an integer number (770428260).

Almost surely, 2^21020311130 is an apocalyptic number.

21020311130 is an abundant number, since it is smaller than the sum of its proper divisors (28287097510).

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

21020311130 is a wasteful number, since it uses less digits than its factorization.

21020311130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358823.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21020311130 its reverse (3111302012), we get a palindrome (24131613142).

The spelling of 21020311130 in words is "twenty-one billion, twenty million, three hundred eleven thousand, one hundred thirty".