121122220221 has 12 divisors (see below), whose sum is σ = 174966715872. Its totient is φ = 80742424776.

The previous prime is 121122220157. The next prime is 121122220229. The reversal of 121122220221 is 122022221121.

It is a happy number.

It is not a de Polignac number, because 121122220221 - 2⁶ = 121122220157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121122220194 and 121122220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122220229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340731 + ... + 598616.

It is an arithmetic number, because the mean of its divisors is an integer number (14580559656).

Almost surely, 2^121122220221 is an apocalyptic number.

It is an amenable number.

121122220221 is a deficient number, since it is larger than the sum of its proper divisors (53844495651).

121122220221 is a wasteful number, since it uses less digits than its factorization.

121122220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953680 (or 953677 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121122220221 its reverse (122022221121), we get a palindrome (243144441342).

The spelling of 121122220221 in words is "one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".