21337970 has 8 divisors (see below), whose sum is σ = 38408364. Its totient is φ = 8535184.

The previous prime is 21337957. The next prime is 21338003. The reversal of 21337970 is 7973312.

It can be written as a sum of positive squares in 2 ways, for example, as 21335161 + 2809 = 4619^2 + 53^2 .

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

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1066889 + ... + 1066908.

Almost surely, 2^21337970 is an apocalyptic number.

21337970 is a deficient number, since it is larger than the sum of its proper divisors (17070394).

21337970 is a wasteful number, since it uses less digits than its factorization.

21337970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133804.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 21337970 is about 4619.3040601372. The cubic root of 21337970 is about 277.3646013167.

It can be divided in two parts, 213 and 37970, that added together give a palindrome (38183).

The spelling of 21337970 in words is "twenty-one million, three hundred thirty-seven thousand, nine hundred seventy".