1200021213121 has 4 divisors (see below), whose sum is σ = 1200129460992. Its totient is φ = 1199912965252.

The previous prime is 1200021212963. The next prime is 1200021213179. The reversal of 1200021213121 is 1213121200021.

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 1200021213121 - 2⁹ = 1200021212609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200021213095 and 1200021213104.

It is not an unprimeable number, because it can be changed into a prime (1200021213221) 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, 54107305 + ... + 54129478.

It is an arithmetic number, because the mean of its divisors is an integer number (300032365248).

Almost surely, 2^{1200021213121} is an apocalyptic number.

It is an amenable number.

1200021213121 is a deficient number, since it is larger than the sum of its proper divisors (108247871).

1200021213121 is a wasteful number, since it uses less digits than its factorization.

1200021213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108247870.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1200021213121 its reverse (1213121200021), we get a palindrome (2413142413142).

The spelling of 1200021213121 in words is "one trillion, two hundred billion, twenty-one million, two hundred thirteen thousand, one hundred twenty-one".