21352370 has 16 divisors (see below), whose sum is σ = 41391000. Its totient is φ = 7883904.

The previous prime is 21352369. The next prime is 21352393. The reversal of 21352370 is 7325312.

It can be written as a sum of positive squares in 4 ways, for example, as 5678689 + 15673681 = 2383^2 + 3959^2 .

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, 81995 + ... + 82254.

Almost surely, 2^21352370 is an apocalyptic number.

21352370 is a deficient number, since it is larger than the sum of its proper divisors (20038630).

21352370 is a wasteful number, since it uses less digits than its factorization.

21352370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164269.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21352370 is about 4620.8624736081. The cubic root of 21352370 is about 277.4269807609.

Adding to 21352370 its reverse (7325312), we get a palindrome (28677682).

The spelling of 21352370 in words is "twenty-one million, three hundred fifty-two thousand, three hundred seventy".