21199255 has 64 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 11980800.

The previous prime is 21199249. The next prime is 21199259. The reversal of 21199255 is 55299112.

It is not a de Polignac number, because 21199255 - 2⁵ = 21199223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21199255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21199259) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 268306 + ... + 268384.

It is an arithmetic number, because the mean of its divisors is an integer number (544320).

Almost surely, 2^21199255 is an apocalyptic number.

21199255 is a deficient number, since it is larger than the sum of its proper divisors (13637225).

21199255 is a wasteful number, since it uses less digits than its factorization.

21199255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160.

The product of its digits is 8100, while the sum is 34.

The square root of 21199255 is about 4604.2648707476. The cubic root of 21199255 is about 276.7622587051.

The spelling of 21199255 in words is "twenty-one million, one hundred ninety-nine thousand, two hundred fifty-five".