102120999989 has 2 divisors, whose sum is σ = 102120999990. Its totient is φ = 102120999988.

The previous prime is 102120999961. The next prime is 102121000019. The reversal of 102120999989 is 989999021201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73294732900 + 28826267089 = 270730^2 + 169783^2 .

It is a cyclic number.

It is not a de Polignac number, because 102120999989 - 2⁸ = 102120999733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102120999289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060499994 + 51060499995.

It is an arithmetic number, because the mean of its divisors is an integer number (51060499995).

Almost surely, 2^102120999989 is an apocalyptic number.

It is an amenable number.

102120999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102120999989 is an equidigital number, since it uses as much as digits as its factorization.

102120999989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 59.

The spelling of 102120999989 in words is "one hundred two billion, one hundred twenty million, nine hundred ninety-nine thousand, nine hundred eighty-nine".