121112222021 has 16 divisors (see below), whose sum is σ = 139296866304. Its totient is φ = 103148612784.

The previous prime is 121112222017. The next prime is 121112222047. The reversal of 121112222021 is 120222211121.

It is not a de Polignac number, because 121112222021 - 2² = 121112222017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112222071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5885276 + ... + 5905818.

It is an arithmetic number, because the mean of its divisors is an integer number (8706054144).

Almost surely, 2^121112222021 is an apocalyptic number.

It is an amenable number.

121112222021 is a deficient number, since it is larger than the sum of its proper divisors (18184644283).

121112222021 is a wasteful number, since it uses less digits than its factorization.

121112222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25880.

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

Adding to 121112222021 its reverse (120222211121), we get a palindrome (241334433142).

The spelling of 121112222021 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, twenty-one".