1212122222121 has 8 divisors (see below), whose sum is σ = 1616177724640. Its totient is φ = 808074100512.

The previous prime is 1212122222099. The next prime is 1212122222123. The reversal of 1212122222121 is 1212222212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212122222121 - 2²⁵ = 1212088667689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212122222123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449940 + ... + 2127573.

It is an arithmetic number, because the mean of its divisors is an integer number (202022215580).

Almost surely, 2^{1212122222121} is an apocalyptic number.

It is an amenable number.

1212122222121 is a deficient number, since it is larger than the sum of its proper divisors (404055502519).

1212122222121 is a wasteful number, since it uses less digits than its factorization.

1212122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690455.

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

Adding to 1212122222121 its reverse (1212222212121), we get a palindrome (2424344434242).

The spelling of 1212122222121 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".