21930110 has 16 divisors (see below), whose sum is σ = 40122432. Its totient is φ = 8628000.

The previous prime is 21930107. The next prime is 21930131. The reversal of 21930110 is 1103912.

It is a happy number.

It is a super-2 number, since 2×21930110² = 961859449224200, 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17366 + ... + 18585.

It is an arithmetic number, because the mean of its divisors is an integer number (2507652).

Almost surely, 2^21930110 is an apocalyptic number.

21930110 is a deficient number, since it is larger than the sum of its proper divisors (18192322).

21930110 is a wasteful number, since it uses less digits than its factorization.

21930110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36019.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 21930110 is about 4682.9595343116. The cubic root of 21930110 is about 279.9068993193.

The spelling of 21930110 in words is "twenty-one million, nine hundred thirty thousand, one hundred ten".