1200111320021 has 4 divisors (see below), whose sum is σ = 1200417240672. Its totient is φ = 1199805399372.

The previous prime is 1200111320017. The next prime is 1200111320063. The reversal of 1200111320021 is 1200231110021.

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 1200111320021 - 2² = 1200111320017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1200111319978 and 1200111320005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111380021) 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, 152954441 + ... + 152962286.

It is an arithmetic number, because the mean of its divisors is an integer number (300104310168).

Almost surely, 2^{1200111320021} is an apocalyptic number.

It is an amenable number.

1200111320021 is a deficient number, since it is larger than the sum of its proper divisors (305920651).

1200111320021 is an equidigital number, since it uses as much as digits as its factorization.

1200111320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305920650.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1200111320021 its reverse (1200231110021), we get a palindrome (2400342430042).

The spelling of 1200111320021 in words is "one trillion, two hundred billion, one hundred eleven million, three hundred twenty thousand, twenty-one".