1021002112139 has 2 divisors, whose sum is σ = 1021002112140. Its totient is φ = 1021002112138.

The previous prime is 1021002112087. The next prime is 1021002112199. The reversal of 1021002112139 is 9312112001201.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021002112139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021002112199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510501056069 + 510501056070.

It is an arithmetic number, because the mean of its divisors is an integer number (510501056070).

Almost surely, 2^{1021002112139} is an apocalyptic number.

1021002112139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021002112139 is an equidigital number, since it uses as much as digits as its factorization.

1021002112139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 1021002112139 in words is "one trillion, twenty-one billion, two million, one hundred twelve thousand, one hundred thirty-nine".