121022022221 has 4 divisors (see below), whose sum is σ = 123596958912. Its totient is φ = 118447085532.

The previous prime is 121022022137. The next prime is 121022022229. The reversal of 121022022221 is 122220220121.

It is a happy number.

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 not a de Polignac number, because 121022022221 - 2¹⁸ = 121021760077 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 121022022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121022022229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287468275 + ... + 1287468368.

It is an arithmetic number, because the mean of its divisors is an integer number (30899239728).

Almost surely, 2^121022022221 is an apocalyptic number.

It is an amenable number.

121022022221 is a deficient number, since it is larger than the sum of its proper divisors (2574936691).

121022022221 is an equidigital number, since it uses as much as digits as its factorization.

121022022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574936690.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121022022221 its reverse (122220220121), we get a palindrome (243242242342).

The spelling of 121022022221 in words is "one hundred twenty-one billion, twenty-two million, twenty-two thousand, two hundred twenty-one".