21131399338488 has 256 divisors, whose sum is σ = 63027030528000. Its totient is φ = 6539521817088.

The previous prime is 21131399338451. The next prime is 21131399338513. The reversal of 21131399338488 is 88483399313112.

21131399338488 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 1 + 39 + 93 + 38 + 488 = 666.

It is a super-2 number, since 2×21131399338488² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 187656570 + ... + 187769142.

It is an arithmetic number, because the mean of its divisors is an integer number (246199338000).

Almost surely, 2^{21131399338488} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21131399338488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31513515264000).

21131399338488 is an abundant number, since it is smaller than the sum of its proper divisors (41895631189512).

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

21131399338488 is a wasteful number, since it uses less digits than its factorization.

21131399338488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113523 (or 113513 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The spelling of 21131399338488 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred ninety-nine million, three hundred thirty-eight thousand, four hundred eighty-eight".