2120001099989 has 2 divisors, whose sum is σ = 2120001099990. Its totient is φ = 2120001099988.

The previous prime is 2120001099929. The next prime is 2120001100039. The reversal of 2120001099989 is 9899901000212.

It is an a-pointer prime, because the next prime (2120001100039) can be obtained adding 2120001099989 to its sum of digits (50).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1694136528100 + 425864571889 = 1301590^2 + 652583^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120001099989 - 2³² = 2115706132693 is a prime.

2120001099989 is a modest number, since divided by 1099989 gives 212 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120001099929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060000549994 + 1060000549995.

It is an arithmetic number, because the mean of its divisors is an integer number (1060000549995).

Almost surely, 2^{2120001099989} is an apocalyptic number.

It is an amenable number.

2120001099989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120001099989 is an equidigital number, since it uses as much as digits as its factorization.

2120001099989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 50.

The spelling of 2120001099989 in words is "two trillion, one hundred twenty billion, one million, ninety-nine thousand, nine hundred eighty-nine".