121222222121 has 64 divisors (see below), whose sum is σ = 164671750656. Its totient is φ = 86171904000.

The previous prime is 121222222117. The next prime is 121222222127.

121222222121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 121222222121 - 2² = 121222222117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121222222093 and 121222222102.

It is not an unprimeable number, because it can be changed into a prime (121222222127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 110502845 + ... + 110503941.

It is an arithmetic number, because the mean of its divisors is an integer number (2572996104).

Almost surely, 2^121222222121 is an apocalyptic number.

121222222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121222222121 is a deficient number, since it is larger than the sum of its proper divisors (43449528535).

121222222121 is a wasteful number, since it uses less digits than its factorization.

121222222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322.

The product of its digits is 256, while the sum is 20.

It can be divided in two parts, 121222 and 222121, that added together give a palindrome (343343).

The spelling of 121222222121 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".