1201112212121 has 4 divisors (see below), whose sum is σ = 1201196261412. Its totient is φ = 1201028162832.

The previous prime is 1201112212117. The next prime is 1201112212127. The reversal of 1201112212121 is 1212122111021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2227368025 + 1198884844096 = 47195^2 + 1094936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201112212121 - 2² = 1201112212117 is a prime.

It is a super-2 number, since 2×1201112212121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201112212121.

It is not an unprimeable number, because it can be changed into a prime (1201112212127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42003206 + ... + 42031791.

It is an arithmetic number, because the mean of its divisors is an integer number (300299065353).

Almost surely, 2^{1201112212121} is an apocalyptic number.

It is an amenable number.

1201112212121 is a deficient number, since it is larger than the sum of its proper divisors (84049291).

1201112212121 is an equidigital number, since it uses as much as digits as its factorization.

1201112212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84049290.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1201112212121 its reverse (1212122111021), we get a palindrome (2413234323142).

The spelling of 1201112212121 in words is "one trillion, two hundred one billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".