221123624161 has 4 divisors (see below), whose sum is σ = 241225771824. Its totient is φ = 201021476500.

The previous prime is 221123624147. The next prime is 221123624171. The reversal of 221123624161 is 161426321122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221123624161 - 2³³ = 212533689569 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221123624171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10051073815 + ... + 10051073836.

It is an arithmetic number, because the mean of its divisors is an integer number (60306442956).

Almost surely, 2^221123624161 is an apocalyptic number.

It is an amenable number.

221123624161 is a deficient number, since it is larger than the sum of its proper divisors (20102147663).

221123624161 is a wasteful number, since it uses less digits than its factorization.

221123624161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20102147662.

The product of its digits is 6912, while the sum is 31.

Adding to 221123624161 its reverse (161426321122), we get a palindrome (382549945283).

The spelling of 221123624161 in words is "two hundred twenty-one billion, one hundred twenty-three million, six hundred twenty-four thousand, one hundred sixty-one".