121122220121 has 16 divisors (see below), whose sum is σ = 142926151680. Its totient is φ = 100445138640.

The previous prime is 121122220073. The next prime is 121122220147. The reversal of 121122220121 is 121022221121.

It is not a de Polignac number, because 121122220121 - 2³⁴ = 103942350937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121122220121.

It is not an unprimeable number, because it can be changed into a prime (121122220151) 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, 835400 + ... + 969606.

It is an arithmetic number, because the mean of its divisors is an integer number (8932884480).

Almost surely, 2^121122220121 is an apocalyptic number.

It is an amenable number.

121122220121 is a deficient number, since it is larger than the sum of its proper divisors (21803931559).

121122220121 is a wasteful number, since it uses less digits than its factorization.

121122220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138404.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121122220121 its reverse (121022221121), we get a palindrome (242144441242).

The spelling of 121122220121 in words is "one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".