221655222201023 has 16 divisors (see below), whose sum is σ = 238900734747360. Its totient is φ = 204437619010944.

The previous prime is 221655222201001. The next prime is 221655222201031. The reversal of 221655222201023 is 320102222556122.

It is a cyclic number.

It is not a de Polignac number, because 221655222201023 - 2¹⁸ = 221655221938879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221655222204023) 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, 146373140 + ... + 147879702.

It is an arithmetic number, because the mean of its divisors is an integer number (14931295921710).

Almost surely, 2^{221655222201023} is an apocalyptic number.

221655222201023 is a deficient number, since it is larger than the sum of its proper divisors (17245512546337).

221655222201023 is a wasteful number, since it uses less digits than its factorization.

221655222201023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515818.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 221655222201023 its reverse (320102222556122), we get a palindrome (541757444757145).

The spelling of 221655222201023 in words is "two hundred twenty-one trillion, six hundred fifty-five billion, two hundred twenty-two million, two hundred one thousand, twenty-three".