21767072 has 24 divisors (see below), whose sum is σ = 45375876. Its totient is φ = 10243072.

The previous prime is 21767069. The next prime is 21767087. The reversal of 21767072 is 27076712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21492496 + 274576 = 4636^2 + 524^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19463 + ... + 20550.

Almost surely, 2^21767072 is an apocalyptic number.

It is an amenable number.

21767072 is an abundant number, since it is smaller than the sum of its proper divisors (23608804).

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

21767072 is a wasteful number, since it uses less digits than its factorization.

21767072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40040 (or 40032 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 21767072 is about 4665.5194780431. The cubic root of 21767072 is about 279.2115232393.

The spelling of 21767072 in words is "twenty-one million, seven hundred sixty-seven thousand, seventy-two".