21371737488 has 40 divisors (see below), whose sum is σ = 55241404800. Its totient is φ = 7119901824.

The previous prime is 21371737487. The next prime is 21371737507. The reversal of 21371737488 is 88473717312.

It is a self number, because there is not a number n which added to its sum of digits gives 21371737488.

It is not an unprimeable number, because it can be changed into a prime (21371737483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38568 + ... + 210311.

It is an arithmetic number, because the mean of its divisors is an integer number (1381035120).

Almost surely, 2^21371737488 is an apocalyptic number.

It is an amenable number.

21371737488 is an abundant number, since it is smaller than the sum of its proper divisors (33869667312).

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

21371737488 is a wasteful number, since it uses less digits than its factorization.

21371737488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250679 (or 250673 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 51.

The spelling of 21371737488 in words is "twenty-one billion, three hundred seventy-one million, seven hundred thirty-seven thousand, four hundred eighty-eight".