21131132313220 has 24 divisors (see below), whose sum is σ = 44375521186584. Its totient is φ = 8452425624576.

The previous prime is 21131132313139. The next prime is 21131132313253. The reversal of 21131132313220 is 2231323113112.

It can be written as a sum of positive squares in 4 ways, for example, as 1122544488004 + 20008587825216 = 1059502^2 + 4473096^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5352942 + ... + 8421178.

It is an arithmetic number, because the mean of its divisors is an integer number (1848980049441).

Almost surely, 2^{21131132313220} is an apocalyptic number.

21131132313220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131132313220 is an abundant number, since it is smaller than the sum of its proper divisors (23244388873364).

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

21131132313220 is a wasteful number, since it uses less digits than its factorization.

21131132313220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3412599 (or 3412597 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21131132313220 its reverse (2231323113112), we get a palindrome (23362455426332).

The spelling of 21131132313220 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred thirty-two million, three hundred thirteen thousand, two hundred twenty".