21740976 has 30 divisors (see below), whose sum is σ = 60844940. Its totient is φ = 7246944.

The previous prime is 21740963. The next prime is 21740987. The reversal of 21740976 is 67904712.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21740976.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75346 + ... + 75633.

Almost surely, 2^21740976 is an apocalyptic number.

It is an amenable number.

21740976 is an abundant number, since it is smaller than the sum of its proper divisors (39103964).

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

21740976 is a wasteful number, since it uses less digits than its factorization.

21740976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150993 (or 150984 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 21740976 is about 4662.7219518217. The cubic root of 21740976 is about 279.0998987078.

The spelling of 21740976 in words is "twenty-one million, seven hundred forty thousand, nine hundred seventy-six".