21262712 has 16 divisors (see below), whose sum is σ = 40030200. Its totient is φ = 10588000.

The previous prime is 21262711. The next prime is 21262727. The reversal of 21262712 is 21726212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21262711) 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 3 ways as a sum of consecutive naturals, for example, 3287 + ... + 7302.

Almost surely, 2^21262712 is an apocalyptic number.

It is an amenable number.

21262712 is a deficient number, since it is larger than the sum of its proper divisors (18767488).

21262712 is a wasteful number, since it uses less digits than its factorization.

21262712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10846 (or 10842 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 21262712 is about 4611.1508324929. The cubic root of 21262712 is about 277.0381333070.

Adding to 21262712 its reverse (21726212), we get a palindrome (42988924).

The spelling of 21262712 in words is "twenty-one million, two hundred sixty-two thousand, seven hundred twelve".