21130331031320 has 128 divisors (see below), whose sum is σ = 58016082263040. Its totient is φ = 6768542753280.

The previous prime is 21130331031307. The next prime is 21130331031331. The reversal of 21130331031320 is 2313013303112.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

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, 37875491 + ... + 38429330.

It is an arithmetic number, because the mean of its divisors is an integer number (453250642680).

Almost surely, 2^{21130331031320} is an apocalyptic number.

21130331031320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130331031320 is an abundant number, since it is smaller than the sum of its proper divisors (36885751231720).

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

21130331031320 is a wasteful number, since it uses less digits than its factorization.

21130331031320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76304905 (or 76304901 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 21130331031320 its reverse (2313013303112), we get a palindrome (23443344334432).

The spelling of 21130331031320 in words is "twenty-one trillion, one hundred thirty billion, three hundred thirty-one million, thirty-one thousand, three hundred twenty".