21901149588 has 24 divisors (see below), whose sum is σ = 51492782880. Its totient is φ = 7244654560.

The previous prime is 21901149541. The next prime is 21901149727. The reversal of 21901149588 is 88594110912.

It is a happy number.

It is a congruent number.

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, 6964443 + ... + 6967586.

It is an arithmetic number, because the mean of its divisors is an integer number (2145532620).

Almost surely, 2^21901149588 is an apocalyptic number.

It is an amenable number.

21901149588 is an abundant number, since it is smaller than the sum of its proper divisors (29591633292).

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

21901149588 is a wasteful number, since it uses less digits than its factorization.

21901149588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13932167 (or 13932165 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 48.

The spelling of 21901149588 in words is "twenty-one billion, nine hundred one million, one hundred forty-nine thousand, five hundred eighty-eight".