21190396 has 24 divisors (see below), whose sum is σ = 39428480. Its totient is φ = 9936432.

The previous prime is 21190349. The next prime is 21190409. The reversal of 21190396 is 69309112.

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, 6475 + ... + 9181.

Almost surely, 2^21190396 is an apocalyptic number.

It is an amenable number.

21190396 is a deficient number, since it is larger than the sum of its proper divisors (18238084).

21190396 is a wasteful number, since it uses less digits than its factorization.

21190396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833 (or 2831 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 21190396 is about 4603.3027273904. The cubic root of 21190396 is about 276.7237010850.

The spelling of 21190396 in words is "twenty-one million, one hundred ninety thousand, three hundred ninety-six".