21073008637704 has 128 divisors (see below), whose sum is σ = 55911928550400. Its totient is φ = 6606894366720.

The previous prime is 21073008637669. The next prime is 21073008637739. The reversal of 21073008637704 is 40773680037012.

It is an interprime number because it is at equal distance from previous prime (21073008637669) and next prime (21073008637739).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25161504 + ... + 25985520.

It is an arithmetic number, because the mean of its divisors is an integer number (436811941800).

Almost surely, 2^{21073008637704} is an apocalyptic number.

21073008637704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21073008637704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27955964275200).

21073008637704 is an abundant number, since it is smaller than the sum of its proper divisors (34838919912696).

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

21073008637704 is a wasteful number, since it uses less digits than its factorization.

21073008637704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825023 (or 825019 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 48.

The spelling of 21073008637704 in words is "twenty-one trillion, seventy-three billion, eight million, six hundred thirty-seven thousand, seven hundred four".