21412372 has 6 divisors (see below), whose sum is σ = 37471658. Its totient is φ = 10706184.

The previous prime is 21412357. The next prime is 21412387. The reversal of 21412372 is 27321412.

It is an interprime number because it is at equal distance from previous prime (21412357) and next prime (21412387).

It can be written as a sum of positive squares in only one way, i.e., 21215236 + 197136 = 4606^2 + 444^2 .

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 as a sum of consecutive naturals, namely, 2676543 + ... + 2676550.

Almost surely, 2^21412372 is an apocalyptic number.

It is an amenable number.

21412372 is a deficient number, since it is larger than the sum of its proper divisors (16059286).

21412372 is a wasteful number, since it uses less digits than its factorization.

21412372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353097 (or 5353095 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 21412372 is about 4627.3504297816. The cubic root of 21412372 is about 277.6866023018.

Adding to 21412372 its reverse (27321412), we get a palindrome (48733784).

The spelling of 21412372 in words is "twenty-one million, four hundred twelve thousand, three hundred seventy-two".