21190311 has 6 divisors (see below), whose sum is σ = 30608240. Its totient is φ = 14126868.

The previous prime is 21190261. The next prime is 21190319. The reversal of 21190311 is 11309112.

It is not a de Polignac number, because 21190311 - 2⁹ = 21189799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21190319) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1177231 + ... + 1177248.

Almost surely, 2^21190311 is an apocalyptic number.

21190311 is a deficient number, since it is larger than the sum of its proper divisors (9417929).

21190311 is a wasteful number, since it uses less digits than its factorization.

21190311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354485 (or 2354482 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 21190311 is about 4603.2934948795. The cubic root of 21190311 is about 276.7233310817.

Adding to 21190311 its reverse (11309112), we get a palindrome (32499423).

The spelling of 21190311 in words is "twenty-one million, one hundred ninety thousand, three hundred eleven".