21937337 has 8 divisors (see below), whose sum is σ = 23081352. Its totient is φ = 20822400.

The previous prime is 21937319. The next prime is 21937373. The reversal of 21937337 is 73373912.

It can be written as a sum of positive squares in 4 ways, for example, as 72361 + 21864976 = 269^2 + 4676^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21937337 - 2⁸ = 21937081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21937297 and 21937306.

It is not an unprimeable number, because it can be changed into a prime (21937387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5714 + ... + 8747.

It is an arithmetic number, because the mean of its divisors is an integer number (2885169).

Almost surely, 2^21937337 is an apocalyptic number.

It is an amenable number.

21937337 is a deficient number, since it is larger than the sum of its proper divisors (1144015).

21937337 is a wasteful number, since it uses less digits than its factorization.

21937337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14539.

The product of its digits is 23814, while the sum is 35.

The square root of 21937337 is about 4683.7310981738. The cubic root of 21937337 is about 279.9376434270.

It can be divided in two parts, 219373 and 37, that multiplied together give a square (8116801 = 2849²).

The spelling of 21937337 in words is "twenty-one million, nine hundred thirty-seven thousand, three hundred thirty-seven".