21520962 has 48 divisors (see below), whose sum is σ = 49083840. Its totient is φ = 6801696.

The previous prime is 21520949. The next prime is 21520999. The reversal of 21520962 is 26902512.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93864 + ... + 94092.

It is an arithmetic number, because the mean of its divisors is an integer number (1022580).

Almost surely, 2^21520962 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21520962, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24541920).

21520962 is an abundant number, since it is smaller than the sum of its proper divisors (27562878).

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

21520962 is a wasteful number, since it uses less digits than its factorization.

21520962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21520962 is about 4639.0690876511. The cubic root of 21520962 is about 278.1552279059.

The spelling of 21520962 in words is "twenty-one million, five hundred twenty thousand, nine hundred sixty-two".