1200122011021 has 4 divisors (see below), whose sum is σ = 1270717423452. Its totient is φ = 1129526598592.

The previous prime is 1200122011013. The next prime is 1200122011043. The reversal of 1200122011021 is 1201102210021.

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 1035894448521 + 164227562500 = 1017789^2 + 405250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200122011021 - 2³ = 1200122011013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200122010992 and 1200122011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200122011051) 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, 35297706190 + ... + 35297706223.

It is an arithmetic number, because the mean of its divisors is an integer number (317679355863).

Almost surely, 2^{1200122011021} is an apocalyptic number.

It is an amenable number.

1200122011021 is a deficient number, since it is larger than the sum of its proper divisors (70595412431).

1200122011021 is an equidigital number, since it uses as much as digits as its factorization.

1200122011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70595412430.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1200122011021 its reverse (1201102210021), we get a palindrome (2401224221042).

The spelling of 1200122011021 in words is "one trillion, two hundred billion, one hundred twenty-two million, eleven thousand, twenty-one".