1200111113021 has 4 divisors (see below), whose sum is σ = 1200269844444. Its totient is φ = 1199952381600.

The previous prime is 1200111113017. The next prime is 1200111113051. The reversal of 1200111113021 is 1203111110021.

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 648485541796 + 551625571225 = 805286^2 + 742715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200111113021 - 2² = 1200111113017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200111112987 and 1200111113005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111113011) 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, 79354370 + ... + 79369491.

It is an arithmetic number, because the mean of its divisors is an integer number (300067461111).

Almost surely, 2^{1200111113021} is an apocalyptic number.

It is an amenable number.

1200111113021 is a deficient number, since it is larger than the sum of its proper divisors (158731423).

1200111113021 is an equidigital number, since it uses as much as digits as its factorization.

1200111113021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158731422.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 1200111113021 its reverse (1203111110021), we get a palindrome (2403222223042).

The spelling of 1200111113021 in words is "one trillion, two hundred billion, one hundred eleven million, one hundred thirteen thousand, twenty-one".