21137488086 has 96 divisors (see below), whose sum is σ = 50058680832. Its totient is φ = 5898372480.

The previous prime is 21137488039. The next prime is 21137488117. The reversal of 21137488086 is 68088473112.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5162256 + ... + 5166348.

It is an arithmetic number, because the mean of its divisors is an integer number (521444592).

Almost surely, 2^21137488086 is an apocalyptic number.

21137488086 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21137488086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25029340416).

21137488086 is an abundant number, since it is smaller than the sum of its proper divisors (28921192746).

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

21137488086 is a wasteful number, since it uses less digits than its factorization.

21137488086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4598 (or 4585 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 21137488086 in words is "twenty-one billion, one hundred thirty-seven million, four hundred eighty-eight thousand, eighty-six".