21446757120 has 144 divisors (see below), whose sum is σ = 68616932832. Its totient is φ = 5709004800.

The previous prime is 21446757109. The next prime is 21446757139. The reversal of 21446757120 is 2175764412.

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, 2303194 + ... + 2312486.

It is an arithmetic number, because the mean of its divisors is an integer number (476506478).

Almost surely, 2^21446757120 is an apocalyptic number.

21446757120 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 21446757120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34308466416).

21446757120 is an abundant number, since it is smaller than the sum of its proper divisors (47170175712).

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

21446757120 is an equidigital number, since it uses as much as digits as its factorization.

21446757120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9918 (or 9904 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The spelling of 21446757120 in words is "twenty-one billion, four hundred forty-six million, seven hundred fifty-seven thousand, one hundred twenty".