21370756 has 24 divisors (see below), whose sum is σ = 41904576. Its totient is φ = 9450720.

The previous prime is 21370753. The next prime is 21370771. The reversal of 21370756 is 65707312.

It is not an unprimeable number, because it can be changed into a prime (21370753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4936 + ... + 8191.

It is an arithmetic number, because the mean of its divisors is an integer number (1746024).

Almost surely, 2^21370756 is an apocalyptic number.

It is an amenable number.

21370756 is a deficient number, since it is larger than the sum of its proper divisors (20533820).

21370756 is a wasteful number, since it uses less digits than its factorization.

21370756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13179 (or 13177 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 21370756 is about 4622.8515009678. The cubic root of 21370756 is about 277.5065864303.

The spelling of 21370756 in words is "twenty-one million, three hundred seventy thousand, seven hundred fifty-six".