21190144 has 20 divisors (see below), whose sum is σ = 42339924. Its totient is φ = 10594816.

The previous prime is 21190139. The next prime is 21190151. The reversal of 21190144 is 44109112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20182 + ... + 21205.

Almost surely, 2^21190144 is an apocalyptic number.

It is an amenable number.

21190144 is a deficient number, since it is larger than the sum of its proper divisors (21149780).

21190144 is an frugal number, since it uses more digits than its factorization.

21190144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41405 (or 41389 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21190144 is about 4603.2753556571. The cubic root of 21190144 is about 276.7226041313.

Adding to 21190144 its reverse (44109112), we get a palindrome (65299256).

The spelling of 21190144 in words is "twenty-one million, one hundred ninety thousand, one hundred forty-four".