221615324241055 has 4 divisors (see below), whose sum is σ = 265938389089272. Its totient is φ = 177292259392840.

The previous prime is 221615324241049. The next prime is 221615324241109. The reversal of 221615324241055 is 550142423516122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221615324241055 - 2³¹ = 221613176757407 is a prime.

It is a super-2 number, since 2×221615324241055² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22161532424101 + ... + 22161532424110.

It is an arithmetic number, because the mean of its divisors is an integer number (66484597272318).

Almost surely, 2^{221615324241055} is an apocalyptic number.

221615324241055 is a deficient number, since it is larger than the sum of its proper divisors (44323064848217).

221615324241055 is an equidigital number, since it uses as much as digits as its factorization.

221615324241055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44323064848216.

The product of its (nonzero) digits is 576000, while the sum is 43.

Adding to 221615324241055 its reverse (550142423516122), we get a palindrome (771757747757177).

The spelling of 221615324241055 in words is "two hundred twenty-one trillion, six hundred fifteen billion, three hundred twenty-four million, two hundred forty-one thousand, fifty-five".