921566420 has 48 divisors (see below), whose sum is σ = 1960495488. Its totient is φ = 363849600.

The previous prime is 921566383. The next prime is 921566473. The reversal of 921566420 is 24665129.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 1015607 + ... + 1016513.

It is an arithmetic number, because the mean of its divisors is an integer number (40843656).

Almost surely, 2^921566420 is an apocalyptic number.

It is an amenable number.

921566420 is an abundant number, since it is smaller than the sum of its proper divisors (1038929068).

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

921566420 is a wasteful number, since it uses less digits than its factorization.

921566420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520 (or 1518 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 921566420 is about 30357.3124633917. The cubic root of 921566420 is about 973.1404996839.

The spelling of 921566420 in words is "nine hundred twenty-one million, five hundred sixty-six thousand, four hundred twenty".