21445288110 has 128 divisors (see below), whose sum is σ = 58146168960. Its totient is φ = 5623354368.

The previous prime is 21445288057. The next prime is 21445288127. The reversal of 21445288110 is 1188254412.

21445288110 is a `hidden beast` number, since 2 + 1 + 44 + 528 + 81 + 10 = 666.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 7350372 + ... + 7353288.

It is an arithmetic number, because the mean of its divisors is an integer number (454266945).

Almost surely, 2^21445288110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21445288110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29073084480).

21445288110 is an abundant number, since it is smaller than the sum of its proper divisors (36700880850).

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

21445288110 is a wasteful number, since it uses less digits than its factorization.

21445288110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379 (or 3373 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The spelling of 21445288110 in words is "twenty-one billion, four hundred forty-five million, two hundred eighty-eight thousand, one hundred ten".