21190374 has 12 divisors (see below), whose sum is σ = 45912516. Its totient is φ = 7063452.

The previous prime is 21190349. The next prime is 21190409. The reversal of 21190374 is 47309112.

It is a congruent number.

It is an unprimeable number.

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, 588604 + ... + 588639.

It is an arithmetic number, because the mean of its divisors is an integer number (3826043).

Almost surely, 2^21190374 is an apocalyptic number.

21190374 is an abundant number, since it is smaller than the sum of its proper divisors (24722142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21190374 is a wasteful number, since it uses less digits than its factorization.

21190374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177251 (or 1177248 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21190374 is about 4603.3003378011. The cubic root of 21190374 is about 276.7236053195.

Adding to 21190374 its reverse (47309112), we get a palindrome (68499486).

The spelling of 21190374 in words is "twenty-one million, one hundred ninety thousand, three hundred seventy-four".