21337238 has 32 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 9108000.

The previous prime is 21337237. The next prime is 21337241. The reversal of 21337238 is 83273312.

It is a self number, because there is not a number n which added to its sum of digits gives 21337238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337231) 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 15 ways as a sum of consecutive naturals, for example, 17963 + ... + 19113.

It is an arithmetic number, because the mean of its divisors is an integer number (1161216).

Almost surely, 2^21337238 is an apocalyptic number.

21337238 is a deficient number, since it is larger than the sum of its proper divisors (15821674).

21337238 is a wasteful number, since it uses less digits than its factorization.

21337238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220.

The product of its digits is 6048, while the sum is 29.

The square root of 21337238 is about 4619.2248267431. The cubic root of 21337238 is about 277.3614296121.

The spelling of 21337238 in words is "twenty-one million, three hundred thirty-seven thousand, two hundred thirty-eight".