21312262 has 16 divisors (see below), whose sum is σ = 34436160. Its totient is φ = 9859752.

The previous prime is 21312257. The next prime is 21312289. The reversal of 21312262 is 26221312.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4888 + ... + 8155.

It is an arithmetic number, because the mean of its divisors is an integer number (2152260).

Almost surely, 2^21312262 is an apocalyptic number.

21312262 is a deficient number, since it is larger than the sum of its proper divisors (13123898).

21312262 is a wasteful number, since it uses less digits than its factorization.

21312262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13107.

The product of its digits is 288, while the sum is 19.

The square root of 21312262 is about 4616.5205512377. The cubic root of 21312262 is about 277.2531668691.

Adding to 21312262 its reverse (26221312), we get a palindrome (47533574).

The spelling of 21312262 in words is "twenty-one million, three hundred twelve thousand, two hundred sixty-two".