21462591720 has 128 divisors (see below), whose sum is σ = 66470025600. Its totient is φ = 5540634624.

The previous prime is 21462591697. The next prime is 21462591737. The reversal of 21462591720 is 2719526412.

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, 564676 + ... + 601484.

It is an arithmetic number, because the mean of its divisors is an integer number (519297075).

Almost surely, 2^21462591720 is an apocalyptic number.

21462591720 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 21462591720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33235012800).

21462591720 is an abundant number, since it is smaller than the sum of its proper divisors (45007433880).

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

21462591720 is a wasteful number, since it uses less digits than its factorization.

21462591720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36979 (or 36975 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 21462591720 in words is "twenty-one billion, four hundred sixty-two million, five hundred ninety-one thousand, seven hundred twenty".