21888850038520 has 64 divisors (see below), whose sum is σ = 50116998780000. Its totient is φ = 8601583016448.

The previous prime is 21888850038509. The next prime is 21888850038533. The reversal of 21888850038520 is 2583005888812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661794 + ... + 6649486.

Almost surely, 2^{21888850038520} is an apocalyptic number.

21888850038520 is a gapful number since it is divisible by the number (20) 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 21888850038520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25058499390000).

21888850038520 is an abundant number, since it is smaller than the sum of its proper divisors (28228148741480).

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

21888850038520 is a wasteful number, since it uses less digits than its factorization.

21888850038520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989312 (or 5989308 counting only the distinct ones).

The product of its (nonzero) digits is 9830400, while the sum is 58.

The spelling of 21888850038520 in words is "twenty-one trillion, eight hundred eighty-eight billion, eight hundred fifty million, thirty-eight thousand, five hundred twenty".