2120999149 has 2 divisors, whose sum is σ = 2120999150. Its totient is φ = 2120999148.

The previous prime is 2120999147. The next prime is 2120999171. The reversal of 2120999149 is 9419990212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1979627049 + 141372100 = 44493^2 + 11890^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120999149 - 2¹ = 2120999147 is a prime.

Together with 2120999147, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2120999099 and 2120999108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120999141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060499574 + 1060499575.

It is an arithmetic number, because the mean of its divisors is an integer number (1060499575).

Almost surely, 2^2120999149 is an apocalyptic number.

It is an amenable number.

2120999149 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120999149 is an equidigital number, since it uses as much as digits as its factorization.

2120999149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 2120999149 is about 46054.3065195862. The cubic root of 2120999149 is about 1284.8334402355.

The spelling of 2120999149 in words is "two billion, one hundred twenty million, nine hundred ninety-nine thousand, one hundred forty-nine".