1222212122121 has 24 divisors (see below), whose sum is σ = 1731434524704. Its totient is φ = 766736535040.

The previous prime is 1222212122107. The next prime is 1222212122147. The reversal of 1222212122121 is 1212212122221.

It is not a de Polignac number, because 1222212122121 - 2¹³ = 1222212113929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222212122101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4667941 + ... + 4922813.

It is an arithmetic number, because the mean of its divisors is an integer number (72143105196).

Almost surely, 2^{1222212122121} is an apocalyptic number.

It is an amenable number.

1222212122121 is a deficient number, since it is larger than the sum of its proper divisors (509222402583).

1222212122121 is a wasteful number, since it uses less digits than its factorization.

1222212122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260441 (or 260424 counting only the distinct ones).

The product of its digits is 256, while the sum is 21.

Adding to 1222212122121 its reverse (1212212122221), we get a palindrome (2434424244342).

The spelling of 1222212122121 in words is "one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twenty-one".