221011031121 has 8 divisors (see below), whose sum is σ = 294710100960. Its totient is φ = 147326324352.

The previous prime is 221011031099. The next prime is 221011031159. The reversal of 221011031121 is 121130110122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221011031121 - 2¹³ = 221011022929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221011031121.

It is not an unprimeable number, because it can be changed into a prime (221011031161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3554811 + ... + 3616448.

It is an arithmetic number, because the mean of its divisors is an integer number (36838762620).

Almost surely, 2^221011031121 is an apocalyptic number.

It is an amenable number.

221011031121 is a deficient number, since it is larger than the sum of its proper divisors (73699069839).

221011031121 is a wasteful number, since it uses less digits than its factorization.

221011031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7181535.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 221011031121 its reverse (121130110122), we get a palindrome (342141141243).

The spelling of 221011031121 in words is "two hundred twenty-one billion, eleven million, thirty-one thousand, one hundred twenty-one".