221240544055231 has 16 divisors (see below), whose sum is σ = 232013378741760. Its totient is φ = 210789427080960.

The previous prime is 221240544055213. The next prime is 221240544055283. The reversal of 221240544055231 is 132550445042122.

It is a cyclic number.

It is not a de Polignac number, because 221240544055231 - 2⁵ = 221240544055199 is a prime.

It is a super-2 number, since 2×221240544055231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221240544755231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392056690 + ... + 392620591.

It is an arithmetic number, because the mean of its divisors is an integer number (14500836171360).

Almost surely, 2^{221240544055231} is an apocalyptic number.

221240544055231 is a deficient number, since it is larger than the sum of its proper divisors (10772834686529).

221240544055231 is an equidigital number, since it uses as much as digits as its factorization.

221240544055231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784677486.

The product of its (nonzero) digits is 384000, while the sum is 40.

Adding to 221240544055231 its reverse (132550445042122), we get a palindrome (353790989097353).

The spelling of 221240544055231 in words is "two hundred twenty-one trillion, two hundred forty billion, five hundred forty-four million, fifty-five thousand, two hundred thirty-one".