1200111201021 has 16 divisors (see below), whose sum is σ = 1602492510528. Its totient is φ = 798902332800.

The previous prime is 1200111201011. The next prime is 1200111201071. The reversal of 1200111201021 is 1201021110021.

It is not a de Polignac number, because 1200111201021 - 2⁵ = 1200111200989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200111200988 and 1200111201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111201011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16645911 + ... + 16717851.

It is an arithmetic number, because the mean of its divisors is an integer number (100155781908).

Almost surely, 2^{1200111201021} is an apocalyptic number.

It is an amenable number.

1200111201021 is a deficient number, since it is larger than the sum of its proper divisors (402381309507).

1200111201021 is an equidigital number, since it uses as much as digits as its factorization.

1200111201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80012.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1200111201021 its reverse (1201021110021), we get a palindrome (2401132311042).

The spelling of 1200111201021 in words is "one trillion, two hundred billion, one hundred eleven million, two hundred one thousand, twenty-one".