21102194 has 16 divisors (see below), whose sum is σ = 32322240. Its totient is φ = 10330320.

The previous prime is 21102187. The next prime is 21102199. The reversal of 21102194 is 49120112.

It is a super-2 number, since 2×21102194² = 890605183227272, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21102199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24137 + ... + 24995.

It is an arithmetic number, because the mean of its divisors is an integer number (2020140).

Almost surely, 2^21102194 is an apocalyptic number.

21102194 is a deficient number, since it is larger than the sum of its proper divisors (11220046).

21102194 is a wasteful number, since it uses less digits than its factorization.

21102194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 21102194 is about 4593.7124420233. The cubic root of 21102194 is about 276.3392261752.

The spelling of 21102194 in words is "twenty-one million, one hundred two thousand, one hundred ninety-four".