121100222121 has 16 divisors (see below), whose sum is σ = 161632920960. Its totient is φ = 80650552320.

The previous prime is 121100222077. The next prime is 121100222147. The reversal of 121100222121 is 121222001121.

It is not a de Polignac number, because 121100222121 - 2²¹ = 121098124969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121100222121.

It is not an unprimeable number, because it can be changed into a prime (121100222021) 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, 15366060 + ... + 15373938.

It is an arithmetic number, because the mean of its divisors is an integer number (10102057560).

Almost surely, 2^121100222121 is an apocalyptic number.

It is an amenable number.

121100222121 is a deficient number, since it is larger than the sum of its proper divisors (40532698839).

121100222121 is a wasteful number, since it uses less digits than its factorization.

121100222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12496.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121100222121 its reverse (121222001121), we get a palindrome (242322223242).

The spelling of 121100222121 in words is "one hundred twenty-one billion, one hundred million, two hundred twenty-two thousand, one hundred twenty-one".