1200021111031 has 2 divisors, whose sum is σ = 1200021111032. Its totient is φ = 1200021111030.

The previous prime is 1200021111011. The next prime is 1200021111049. The reversal of 1200021111031 is 1301111200021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1200021111031 - 2²³ = 1200012722423 is a prime.

It is a super-2 number, since 2×1200021111031² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200021111011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010555515 + 600010555516.

It is an arithmetic number, because the mean of its divisors is an integer number (600010555516).

Almost surely, 2^{1200021111031} is an apocalyptic number.

1200021111031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200021111031 is an equidigital number, since it uses as much as digits as its factorization.

1200021111031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1200021111031 its reverse (1301111200021), we get a palindrome (2501132311052).

The spelling of 1200021111031 in words is "one trillion, two hundred billion, twenty-one million, one hundred eleven thousand, thirty-one".