1200022002121 has 4 divisors (see below), whose sum is σ = 1200155184144. Its totient is φ = 1199888820100.

The previous prime is 1200022002089. The next prime is 1200022002167. The reversal of 1200022002121 is 1212002200021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1200022002121 - 2⁵ = 1200022002089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200022006121) 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, 66577495 + ... + 66595516.

It is an arithmetic number, because the mean of its divisors is an integer number (300038796036).

Almost surely, 2^{1200022002121} is an apocalyptic number.

It is an amenable number.

1200022002121 is a deficient number, since it is larger than the sum of its proper divisors (133182023).

1200022002121 is an equidigital number, since it uses as much as digits as its factorization.

1200022002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133182022.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1200022002121 its reverse (1212002200021), we get a palindrome (2412024202142).

The spelling of 1200022002121 in words is "one trillion, two hundred billion, twenty-two million, two thousand, one hundred twenty-one".