21796190 has 16 divisors (see below), whose sum is σ = 42251328. Its totient is φ = 8047776.

The previous prime is 21796183. The next prime is 21796199. The reversal of 21796190 is 9169712.

It is a super-2 number, since 2×21796190² = 950147797032200, which contains 22 as substring.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 21796190.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796199) by changing a digit.

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, 83702 + ... + 83961.

It is an arithmetic number, because the mean of its divisors is an integer number (2640708).

Almost surely, 2^21796190 is an apocalyptic number.

21796190 is a deficient number, since it is larger than the sum of its proper divisors (20455138).

21796190 is a wasteful number, since it uses less digits than its factorization.

21796190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167683.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 21796190 is about 4668.6389879707. The cubic root of 21796190 is about 279.3359689862.

The spelling of 21796190 in words is "twenty-one million, seven hundred ninety-six thousand, one hundred ninety".