1121222212121 has 16 divisors (see below), whose sum is σ = 1236886056576. Its totient is φ = 1007874000000.

The previous prime is 1121222212063. The next prime is 1121222212169. The reversal of 1121222212121 is 1212122221211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121222212121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121222212093 and 1121222212102.

It is not an unprimeable number, because it can be changed into a prime (1121222212921) 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, 182396 + ... + 1508546.

It is an arithmetic number, because the mean of its divisors is an integer number (77305378536).

Almost surely, 2^{1121222212121} is an apocalyptic number.

1121222212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121222212121 is a deficient number, since it is larger than the sum of its proper divisors (115663844455).

1121222212121 is a wasteful number, since it uses less digits than its factorization.

1121222212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327024.

The product of its digits is 128, while the sum is 20.

Adding to 1121222212121 its reverse (1212122221211), we get a palindrome (2333344433332).

The spelling of 1121222212121 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".