21211190 has 96 divisors (see below), whose sum is σ = 51860736. Its totient is φ = 6065280.

The previous prime is 21211181. The next prime is 21211217. The reversal of 21211190 is 9111212.

21211190 = 613² + 614² + ... + 664².

It is a super-2 number, since 2×21211190² = 899829162432200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 130049 + ... + 130211.

It is an arithmetic number, because the mean of its divisors is an integer number (540216).

Almost surely, 2^21211190 is an apocalyptic number.

21211190 is an abundant number, since it is smaller than the sum of its proper divisors (30649546).

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

21211190 is a wasteful number, since it uses less digits than its factorization.

21211190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21211190 is about 4605.5607693309. The cubic root of 21211190 is about 276.8141872260.

The spelling of 21211190 in words is "twenty-one million, two hundred eleven thousand, one hundred ninety".