21444837088 has 12 divisors (see below), whose sum is σ = 42219523080. Its totient is φ = 10722418528.

The previous prime is 21444837059. The next prime is 21444837097. The reversal of 21444837088 is 88073844412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335075548 + ... + 335075611.

It is an arithmetic number, because the mean of its divisors is an integer number (3518293590).

Almost surely, 2^21444837088 is an apocalyptic number.

It is an amenable number.

21444837088 is a deficient number, since it is larger than the sum of its proper divisors (20774685992).

21444837088 is an equidigital number, since it uses as much as digits as its factorization.

21444837088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670151169 (or 670151161 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 49.

The spelling of 21444837088 in words is "twenty-one billion, four hundred forty-four million, eight hundred thirty-seven thousand, eighty-eight".