221100972255 has 24 divisors (see below), whose sum is σ = 383442169968. Its totient is φ = 117858830976.

The previous prime is 221100972251. The next prime is 221100972259. The reversal of 221100972255 is 552279001122.

It is an interprime number because it is at equal distance from previous prime (221100972251) and next prime (221100972259).

It is not a de Polignac number, because 221100972255 - 2² = 221100972251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100972251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1198117 + ... + 1370286.

It is an arithmetic number, because the mean of its divisors is an integer number (15976757082).

Almost surely, 2^221100972255 is an apocalyptic number.

221100972255 is a deficient number, since it is larger than the sum of its proper divisors (162341197713).

221100972255 is a wasteful number, since it uses less digits than its factorization.

221100972255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570327 (or 2570324 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

Adding to 221100972255 its reverse (552279001122), we get a palindrome (773379973377).

The spelling of 221100972255 in words is "two hundred twenty-one billion, one hundred million, nine hundred seventy-two thousand, two hundred fifty-five".