21774768 has 20 divisors (see below), whose sum is σ = 56251608. Its totient is φ = 7258240.

The previous prime is 21774763. The next prime is 21774769. The reversal of 21774768 is 86747712.

It is not an unprimeable number, because it can be changed into a prime (21774763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226773 + ... + 226868.

Almost surely, 2^21774768 is an apocalyptic number.

It is an amenable number.

21774768 is an abundant number, since it is smaller than the sum of its proper divisors (34476840).

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

21774768 is a wasteful number, since it uses less digits than its factorization.

21774768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453652 (or 453646 counting only the distinct ones).

The product of its digits is 131712, while the sum is 42.

The square root of 21774768 is about 4666.3441793335. The cubic root of 21774768 is about 279.2444255162.

The spelling of 21774768 in words is "twenty-one million, seven hundred seventy-four thousand, seven hundred sixty-eight".