21196255 has 4 divisors (see below), whose sum is σ = 25435512. Its totient is φ = 16957000.

The previous prime is 21196223. The next prime is 21196261. The reversal of 21196255 is 55269112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21196255 - 2⁵ = 21196223 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2119621 + ... + 2119630.

It is an arithmetic number, because the mean of its divisors is an integer number (6358878).

Almost surely, 2^21196255 is an apocalyptic number.

21196255 is a deficient number, since it is larger than the sum of its proper divisors (4239257).

21196255 is an equidigital number, since it uses as much as digits as its factorization.

21196255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4239256.

The product of its digits is 5400, while the sum is 31.

The square root of 21196255 is about 4603.9390743145. The cubic root of 21196255 is about 276.7492028069.

The spelling of 21196255 in words is "twenty-one million, one hundred ninety-six thousand, two hundred fifty-five".