21262772 has 12 divisors (see below), whose sum is σ = 37319520. Its totient is φ = 10600056.

The previous prime is 21262757. The next prime is 21262789. The reversal of 21262772 is 27726212.

It is a congruent number.

It is an unprimeable number.

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, 6272 + ... + 9047.

It is an arithmetic number, because the mean of its divisors is an integer number (3109960).

Almost surely, 2^21262772 is an apocalyptic number.

It is an amenable number.

21262772 is a deficient number, since it is larger than the sum of its proper divisors (16056748).

21262772 is a wasteful number, since it uses less digits than its factorization.

21262772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15670 (or 15668 counting only the distinct ones).

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

The square root of 21262772 is about 4611.1573384564. The cubic root of 21262772 is about 277.0383938927.

Adding to 21262772 its reverse (27726212), we get a palindrome (48988984).

The spelling of 21262772 in words is "twenty-one million, two hundred sixty-two thousand, seven hundred seventy-two".