21338612 has 6 divisors (see below), whose sum is σ = 37342578. Its totient is φ = 10669304.

The previous prime is 21338609. The next prime is 21338617. The reversal of 21338612 is 21683312.

It can be written as a sum of positive squares in only one way, i.e., 20557156 + 781456 = 4534^2 + 884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2667323 + ... + 2667330.

It is an arithmetic number, because the mean of its divisors is an integer number (6223763).

Almost surely, 2^21338612 is an apocalyptic number.

It is an amenable number.

21338612 is a deficient number, since it is larger than the sum of its proper divisors (16003966).

21338612 is a wasteful number, since it uses less digits than its factorization.

21338612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5334657 (or 5334655 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 21338612 is about 4619.3735506019. The cubic root of 21338612 is about 277.3673829978.

The spelling of 21338612 in words is "twenty-one million, three hundred thirty-eight thousand, six hundred twelve".