2117598121 has 2 divisors, whose sum is σ = 2117598122. Its totient is φ = 2117598120.

The previous prime is 2117598107. The next prime is 2117598137. The reversal of 2117598121 is 1218957112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1792336896 + 325261225 = 42336^2 + 18035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2117598121 - 2¹¹ = 2117596073 is a prime.

It is not a weakly prime, because it can be changed into another prime (2117598521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058799060 + 1058799061.

It is an arithmetic number, because the mean of its divisors is an integer number (1058799061).

Almost surely, 2^2117598121 is an apocalyptic number.

It is an amenable number.

2117598121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117598121 is an equidigital number, since it uses as much as digits as its factorization.

2117598121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 37.

The square root of 2117598121 is about 46017.3676018088. The cubic root of 2117598121 is about 1284.1463281845.

The spelling of 2117598121 in words is "two billion, one hundred seventeen million, five hundred ninety-eight thousand, one hundred twenty-one".