21301370 has 16 divisors (see below), whose sum is σ = 39665160. Its totient is φ = 8226624.

The previous prime is 21301363. The next prime is 21301403. The reversal of 21301370 is 7310312.

It can be written as a sum of positive squares in 4 ways, for example, as 18515809 + 2785561 = 4303^2 + 1669^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36437 + ... + 37016.

Almost surely, 2^21301370 is an apocalyptic number.

21301370 is a deficient number, since it is larger than the sum of its proper divisors (18363790).

21301370 is a wasteful number, since it uses less digits than its factorization.

21301370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73489.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 21301370 is about 4615.3407241503. The cubic root of 21301370 is about 277.2059271457.

Adding to 21301370 its reverse (7310312), we get a palindrome (28611682).

The spelling of 21301370 in words is "twenty-one million, three hundred one thousand, three hundred seventy".