221155432245 has 96 divisors (see below), whose sum is σ = 436438840320. Its totient is φ = 106164432000.

The previous prime is 221155432243. The next prime is 221155432261. The reversal of 221155432245 is 542234551122.

221155432245 is a `hidden beast` number, since 2 + 211 + 5 + 5 + 432 + 2 + 4 + 5 = 666.

It is not a de Polignac number, because 221155432245 - 2¹ = 221155432243 is a prime.

It is a super-2 number, since 2×221155432245² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221155432243) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1582812 + ... + 1716858.

It is an arithmetic number, because the mean of its divisors is an integer number (4546237920).

Almost surely, 2^221155432245 is an apocalyptic number.

It is an amenable number.

221155432245 is a deficient number, since it is larger than the sum of its proper divisors (215283408075).

221155432245 is a wasteful number, since it uses less digits than its factorization.

221155432245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134184 (or 134167 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

Adding to 221155432245 its reverse (542234551122), we get a palindrome (763389983367).

The spelling of 221155432245 in words is "two hundred twenty-one billion, one hundred fifty-five million, four hundred thirty-two thousand, two hundred forty-five".