1200313021 has 2 divisors, whose sum is σ = 1200313022. Its totient is φ = 1200313020.

The previous prime is 1200312989. The next prime is 1200313027. The reversal of 1200313021 is 1203130021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620707396 + 579605625 = 24914^2 + 24075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200313021 - 2⁵ = 1200312989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200312992 and 1200313010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200313027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600156510 + 600156511.

It is an arithmetic number, because the mean of its divisors is an integer number (600156511).

Almost surely, 2^1200313021 is an apocalyptic number.

It is an amenable number.

1200313021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200313021 is an equidigital number, since it uses as much as digits as its factorization.

1200313021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1200313021 is about 34645.5339257458. The cubic root of 1200313021 is about 1062.7509596075.

Adding to 1200313021 its reverse (1203130021), we get a palindrome (2403443042).

The spelling of 1200313021 in words is "one billion, two hundred million, three hundred thirteen thousand, twenty-one".