1200020213081 has 2 divisors, whose sum is σ = 1200020213082. Its totient is φ = 1200020213080.

The previous prime is 1200020212991. The next prime is 1200020213087. The reversal of 1200020213081 is 1803120200021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1191352603081 + 8667610000 = 1091491^2 + 93100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200020213081 - 2¹⁰ = 1200020212057 is a prime.

It is a super-2 number, since 2×1200020213081² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1200020213087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010106540 + 600010106541.

It is an arithmetic number, because the mean of its divisors is an integer number (600010106541).

Almost surely, 2^{1200020213081} is an apocalyptic number.

It is an amenable number.

1200020213081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200020213081 is an equidigital number, since it uses as much as digits as its factorization.

1200020213081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The spelling of 1200020213081 in words is "one trillion, two hundred billion, twenty million, two hundred thirteen thousand, eighty-one".