2172621255 has 32 divisors (see below), whose sum is σ = 4027229184. Its totient is φ = 979589376.

The previous prime is 2172621247. The next prime is 2172621257. The reversal of 2172621255 is 5521262712.

It is not a de Polignac number, because 2172621255 - 2³ = 2172621247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172621257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134059 + ... + 149388.

It is an arithmetic number, because the mean of its divisors is an integer number (125850912).

Almost surely, 2^2172621255 is an apocalyptic number.

2172621255 is a deficient number, since it is larger than the sum of its proper divisors (1854607929).

2172621255 is a wasteful number, since it uses less digits than its factorization.

2172621255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283535.

The product of its digits is 16800, while the sum is 33.

The square root of 2172621255 is about 46611.3854653560. The cubic root of 2172621255 is about 1295.1736731839.

Adding to 2172621255 its reverse (5521262712), we get a palindrome (7693883967).

The spelling of 2172621255 in words is "two billion, one hundred seventy-two million, six hundred twenty-one thousand, two hundred fifty-five".