21106190 has 32 divisors (see below), whose sum is σ = 44245440. Its totient is φ = 7098624.

The previous prime is 21106187. The next prime is 21106199. The reversal of 21106190 is 9160112.

It is a super-2 number, since 2×21106190² = 890942512632200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 866 + ... + 6554.

It is an arithmetic number, because the mean of its divisors is an integer number (1382670).

Almost surely, 2^21106190 is an apocalyptic number.

21106190 is an abundant number, since it is smaller than the sum of its proper divisors (23139250).

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

21106190 is a wasteful number, since it uses less digits than its factorization.

21106190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5756.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 21106190 is about 4594.1473637662. The cubic root of 21106190 is about 276.3566679927.

The spelling of 21106190 in words is "twenty-one million, one hundred six thousand, one hundred ninety".