1200021013 has 2 divisors, whose sum is σ = 1200021014. Its totient is φ = 1200021012.

The previous prime is 1200020999. The next prime is 1200021077. The reversal of 1200021013 is 3101200021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 835325604 + 364695409 = 28902^2 + 19097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200021013 is a prime.

It is a super-3 number, since 3×1200021013³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200001013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010506 + 600010507.

It is an arithmetic number, because the mean of its divisors is an integer number (600010507).

Almost surely, 2^1200021013 is an apocalyptic number.

It is an amenable number.

1200021013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200021013 is an equidigital number, since it uses as much as digits as its factorization.

1200021013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1200021013 is about 34641.3194465800. The cubic root of 1200021013 is about 1062.6647718254.

Adding to 1200021013 its reverse (3101200021), we get a palindrome (4301221034).

The spelling of 1200021013 in words is "one billion, two hundred million, twenty-one thousand, thirteen".