1200121111021 has 4 divisors (see below), whose sum is σ = 1371566984032. Its totient is φ = 1028675238012.

The previous prime is 1200121111009. The next prime is 1200121111027. The reversal of 1200121111021 is 1201111210021.

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 1200121111021 - 2⁵ = 1200121110989 is a prime.

It is a super-2 number, since 2×1200121111021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1200121110992 and 1200121111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121111027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85722936495 + ... + 85722936508.

It is an arithmetic number, because the mean of its divisors is an integer number (342891746008).

Almost surely, 2^{1200121111021} is an apocalyptic number.

It is an amenable number.

1200121111021 is a deficient number, since it is larger than the sum of its proper divisors (171445873011).

1200121111021 is an equidigital number, since it uses as much as digits as its factorization.

1200121111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171445873010.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1200121111021 its reverse (1201111210021), we get a palindrome (2401232321042).

The spelling of 1200121111021 in words is "one trillion, two hundred billion, one hundred twenty-one million, one hundred eleven thousand, twenty-one".