21770264 has 16 divisors (see below), whose sum is σ = 40914720. Its totient is φ = 10859680.

The previous prime is 21770263. The next prime is 21770269. The reversal of 21770264 is 46207712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21770263) 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, 737 + ... + 6639.

It is an arithmetic number, because the mean of its divisors is an integer number (2557170).

Almost surely, 2^21770264 is an apocalyptic number.

It is an amenable number.

21770264 is a deficient number, since it is larger than the sum of its proper divisors (19144456).

21770264 is a wasteful number, since it uses less digits than its factorization.

21770264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6370 (or 6366 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 21770264 is about 4665.8615495962. The cubic root of 21770264 is about 279.2251707588.

Adding to 21770264 its reverse (46207712), we get a palindrome (67977976).

The spelling of 21770264 in words is "twenty-one million, seven hundred seventy thousand, two hundred sixty-four".