2522117821 has 2 divisors, whose sum is σ = 2522117822. Its totient is φ = 2522117820.

The previous prime is 2522117813. The next prime is 2522117827. The reversal of 2522117821 is 1287112252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2422017796 + 100100025 = 49214^2 + 10005^2 .

It is a cyclic number.

It is not a de Polignac number, because 2522117821 - 2³ = 2522117813 is a prime.

It is a super-2 number, since 2×2522117821² = 12722156606011576082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2522117827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1261058910 + 1261058911.

It is an arithmetic number, because the mean of its divisors is an integer number (1261058911).

Almost surely, 2^2522117821 is an apocalyptic number.

It is an amenable number.

2522117821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2522117821 is an equidigital number, since it uses as much as digits as its factorization.

2522117821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 31.

The square root of 2522117821 is about 50220.6911641009. The cubic root of 2522117821 is about 1361.1995293904.

The spelling of 2522117821 in words is "two billion, five hundred twenty-two million, one hundred seventeen thousand, eight hundred twenty-one".