7121122257 has 4 divisors (see below), whose sum is σ = 9494829680. Its totient is φ = 4747414836.

The previous prime is 7121122223. The next prime is 7121122259. The reversal of 7121122257 is 7522211217.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7121122257 - 2¹⁰ = 7121121233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7121122259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186853707 + ... + 1186853712.

It is an arithmetic number, because the mean of its divisors is an integer number (2373707420).

Almost surely, 2^7121122257 is an apocalyptic number.

It is an amenable number.

7121122257 is a deficient number, since it is larger than the sum of its proper divisors (2373707423).

7121122257 is a wasteful number, since it uses less digits than its factorization.

7121122257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373707422.

The product of its digits is 3920, while the sum is 30.

The square root of 7121122257 is about 84386.7421873839. The cubic root of 7121122257 is about 1923.9014146095.

The spelling of 7121122257 in words is "seven billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred fifty-seven".