21492190 has 32 divisors (see below), whose sum is σ = 41122080. Its totient is φ = 8072064.

The previous prime is 21492167. The next prime is 21492203. The reversal of 21492190 is 9129412.

It is a happy number.

It is a super-2 number, since 2×21492190² = 923828461992200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9729 + ... + 11731.

It is an arithmetic number, because the mean of its divisors is an integer number (1285065).

Almost surely, 2^21492190 is an apocalyptic number.

21492190 is a deficient number, since it is larger than the sum of its proper divisors (19629890).

21492190 is a wasteful number, since it uses less digits than its factorization.

21492190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21492190 is about 4635.9669972941. The cubic root of 21492190 is about 278.0312146859.

The spelling of 21492190 in words is "twenty-one million, four hundred ninety-two thousand, one hundred ninety".