21774712 has 16 divisors (see below), whose sum is σ = 41203800. Its totient is φ = 10787040.

The previous prime is 21774707. The next prime is 21774713. The reversal of 21774712 is 21747712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774713) 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, 11614 + ... + 13357.

Almost surely, 2^21774712 is an apocalyptic number.

It is an amenable number.

21774712 is a deficient number, since it is larger than the sum of its proper divisors (19429088).

21774712 is a wasteful number, since it uses less digits than its factorization.

21774712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25086 (or 25082 counting only the distinct ones).

The product of its digits is 5488, while the sum is 31.

The square root of 21774712 is about 4666.3381789150. The cubic root of 21774712 is about 279.2441861305.

Subtracting from 21774712 its reverse (21747712), we obtain a cube (27000 = 30³).

It can be divided in two parts, 2177 and 4712, that added together give a square (6889 = 83²).

The spelling of 21774712 in words is "twenty-one million, seven hundred seventy-four thousand, seven hundred twelve".