21122710 has 16 divisors (see below), whose sum is σ = 43452576. Its totient is φ = 7242048.

The previous prime is 21122707. The next prime is 21122719. The reversal of 21122710 is 1722112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150807 + ... + 150946.

It is an arithmetic number, because the mean of its divisors is an integer number (2715786).

Almost surely, 2^21122710 is an apocalyptic number.

21122710 is an abundant number, since it is smaller than the sum of its proper divisors (22329866).

21122710 is a wasteful number, since it uses less digits than its factorization.

21122710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301767.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21122710 is about 4595.9449518026. The cubic root of 21122710 is about 276.4287514517.

Adding to 21122710 its reverse (1722112), we get a palindrome (22844822).

The spelling of 21122710 in words is "twenty-one million, one hundred twenty-two thousand, seven hundred ten".