21237368 has 8 divisors (see below), whose sum is σ = 39820080. Its totient is φ = 10618680.

The previous prime is 21237353. The next prime is 21237389. The reversal of 21237368 is 86373212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1327328 + ... + 1327343.

It is an arithmetic number, because the mean of its divisors is an integer number (4977510).

Almost surely, 2^21237368 is an apocalyptic number.

It is an amenable number.

21237368 is a deficient number, since it is larger than the sum of its proper divisors (18582712).

21237368 is a wasteful number, since it uses less digits than its factorization.

21237368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654677 (or 2654673 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 21237368 is about 4608.4018921965. The cubic root of 21237368 is about 276.9280180663.

The spelling of 21237368 in words is "twenty-one million, two hundred thirty-seven thousand, three hundred sixty-eight".