21131301888 has 264 divisors, whose sum is σ = 64239379776. Its totient is φ = 6677299200.

The previous prime is 21131301853. The next prime is 21131301901. The reversal of 21131301888 is 88810313112.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27767428 + ... + 27768188.

It is an arithmetic number, because the mean of its divisors is an integer number (243330984).

Almost surely, 2^21131301888 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 21131301888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32119689888).

21131301888 is an abundant number, since it is smaller than the sum of its proper divisors (43108077888).

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

21131301888 is a wasteful number, since it uses less digits than its factorization.

21131301888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 21131301888 in words is "twenty-one billion, one hundred thirty-one million, three hundred one thousand, eight hundred eighty-eight".