21000131012220 has 48 divisors (see below), whose sum is σ = 58903706766240. Its totient is φ = 5590193038336.

The previous prime is 21000131012207. The next prime is 21000131012221. The reversal of 21000131012220 is 2221013100012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21000131012220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000131012221) 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, 307524897 + ... + 307593176.

It is an arithmetic number, because the mean of its divisors is an integer number (1227160557630).

Almost surely, 2^{21000131012220} is an apocalyptic number.

21000131012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000131012220 is an abundant number, since it is smaller than the sum of its proper divisors (37903575754020).

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

21000131012220 is a wasteful number, since it uses less digits than its factorization.

21000131012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615118654 (or 615118652 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21000131012220 its reverse (2221013100012), we get a palindrome (23221144112232).

The spelling of 21000131012220 in words is "twenty-one trillion, one hundred thirty-one million, twelve thousand, two hundred twenty".