2190308121 has 20 divisors (see below), whose sum is σ = 3275234292. Its totient is φ = 1458736128.

The previous prime is 2190308117. The next prime is 2190308161. The reversal of 2190308121 is 1218030912.

It can be written as a sum of positive squares in 2 ways, for example, as 2110116096 + 80192025 = 45936^2 + 8955^2 .

It is not a de Polignac number, because 2190308121 - 2² = 2190308117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2190308161) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 70585 + ... + 96761.

Almost surely, 2^2190308121 is an apocalyptic number.

It is an amenable number.

2190308121 is a deficient number, since it is larger than the sum of its proper divisors (1084926171).

2190308121 is a wasteful number, since it uses less digits than its factorization.

2190308121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27222 (or 27213 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2190308121 is about 46800.7277828027. The cubic root of 2190308121 is about 1298.6787603900.

The spelling of 2190308121 in words is "two billion, one hundred ninety million, three hundred eight thousand, one hundred twenty-one".