1200023312021 has 4 divisors (see below), whose sum is σ = 1201298576844. Its totient is φ = 1198748047200.

The previous prime is 1200023311987. The next prime is 1200023312023. The reversal of 1200023312021 is 1202133200021.

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 869267199025 + 330756112996 = 932345^2 + 575114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200023312021 - 2¹⁸ = 1200023049877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200023312023) 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, 637631000 + ... + 637632881.

It is an arithmetic number, because the mean of its divisors is an integer number (300324644211).

Almost surely, 2^{1200023312021} is an apocalyptic number.

It is an amenable number.

1200023312021 is a deficient number, since it is larger than the sum of its proper divisors (1275264823).

1200023312021 is an equidigital number, since it uses as much as digits as its factorization.

1200023312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275264822.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1200023312021 its reverse (1202133200021), we get a palindrome (2402156512042).

The spelling of 1200023312021 in words is "one trillion, two hundred billion, twenty-three million, three hundred twelve thousand, twenty-one".