21190270 has 16 divisors (see below), whose sum is σ = 39174048. Its totient is φ = 8246880.

The previous prime is 21190261. The next prime is 21190319. The reversal of 21190270 is 7209112.

It is a congruent number.

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, 28266 + ... + 29005.

It is an arithmetic number, because the mean of its divisors is an integer number (2448378).

Almost surely, 2^21190270 is an apocalyptic number.

21190270 is a deficient number, since it is larger than the sum of its proper divisors (17983778).

21190270 is a wasteful number, since it uses less digits than its factorization.

21190270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57315.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 21190270 is about 4603.2890415441. The cubic root of 21190270 is about 276.7231526092.

Adding to 21190270 its reverse (7209112), we get a palindrome (28399382).

The spelling of 21190270 in words is "twenty-one million, one hundred ninety thousand, two hundred seventy".