221302131121 has 4 divisors (see below), whose sum is σ = 224103424000. Its totient is φ = 218500838244.

The previous prime is 221302131067. The next prime is 221302131131. The reversal of 221302131121 is 121131203122.

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 a de Polignac number, because none of the positive numbers 2^k-221302131121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221302131131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400646321 + ... + 1400646478.

It is an arithmetic number, because the mean of its divisors is an integer number (56025856000).

Almost surely, 2^221302131121 is an apocalyptic number.

It is an amenable number.

221302131121 is a deficient number, since it is larger than the sum of its proper divisors (2801292879).

221302131121 is an equidigital number, since it uses as much as digits as its factorization.

221302131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801292878.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221302131121 its reverse (121131203122), we get a palindrome (342433334243).

The spelling of 221302131121 in words is "two hundred twenty-one billion, three hundred two million, one hundred thirty-one thousand, one hundred twenty-one".