2351221109 has 2 divisors, whose sum is σ = 2351221110. Its totient is φ = 2351221108.

The previous prime is 2351221039. The next prime is 2351221141. The reversal of 2351221109 is 9011221532.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2143227025 + 207994084 = 46295^2 + 14422^2 .

It is a cyclic number.

It is not a de Polignac number, because 2351221109 - 2²⁰ = 2350172533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2351221189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1175610554 + 1175610555.

It is an arithmetic number, because the mean of its divisors is an integer number (1175610555).

Almost surely, 2^2351221109 is an apocalyptic number.

It is an amenable number.

2351221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2351221109 is an equidigital number, since it uses as much as digits as its factorization.

2351221109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 2351221109 is about 48489.3917161269. The cubic root of 2351221109 is about 1329.7331345021.

The spelling of 2351221109 in words is "two billion, three hundred fifty-one million, two hundred twenty-one thousand, one hundred nine".