21770464 has 12 divisors (see below), whose sum is σ = 42860664. Its totient is φ = 10885216.

The previous prime is 21770453. The next prime is 21770471. The reversal of 21770464 is 46407712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340132 + ... + 340195.

It is an arithmetic number, because the mean of its divisors is an integer number (3571722).

Almost surely, 2^21770464 is an apocalyptic number.

It is an amenable number.

21770464 is a deficient number, since it is larger than the sum of its proper divisors (21090200).

21770464 is an equidigital number, since it uses as much as digits as its factorization.

21770464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680337 (or 680329 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 21770464 is about 4665.8829818160. The cubic root of 21770464 is about 279.2260258222.

The spelling of 21770464 in words is "twenty-one million, seven hundred seventy thousand, four hundred sixty-four".