221232131121 has 16 divisors (see below), whose sum is σ = 295477056000. Its totient is φ = 147237813888.

The previous prime is 221232131053. The next prime is 221232131137. The reversal of 221232131121 is 121131232122.

It is not a de Polignac number, because 221232131121 - 2⁷ = 221232130993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221232031121) 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, 5716725 + ... + 5755293.

It is an arithmetic number, because the mean of its divisors is an integer number (18467316000).

Almost surely, 2^221232131121 is an apocalyptic number.

It is an amenable number.

221232131121 is a deficient number, since it is larger than the sum of its proper divisors (74244924879).

221232131121 is a wasteful number, since it uses less digits than its factorization.

221232131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41768.

The product of its digits is 288, while the sum is 21.

Adding to 221232131121 its reverse (121131232122), we get a palindrome (342363363243).

The spelling of 221232131121 in words is "two hundred twenty-one billion, two hundred thirty-two million, one hundred thirty-one thousand, one hundred twenty-one".