115222021 has 2 divisors, whose sum is σ = 115222022. Its totient is φ = 115222020.

The previous prime is 115222007. The next prime is 115222031. The reversal of 115222021 is 120222511.

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., 77264100 + 37957921 = 8790^2 + 6161^2 .

It is an emirp because it is prime and its reverse (120222511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115222021 - 2⁵ = 115221989 is a prime.

It is a super-2 number, since 2×115222021² = 26552228246648882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 115221986 and 115222004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115222031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57611010 + 57611011.

It is an arithmetic number, because the mean of its divisors is an integer number (57611011).

Almost surely, 2^115222021 is an apocalyptic number.

It is an amenable number.

115222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

115222021 is an equidigital number, since it uses as much as digits as its factorization.

115222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 115222021 is about 10734.1520857495. The cubic root of 115222021 is about 486.6071614137.

Adding to 115222021 its reverse (120222511), we get a palindrome (235444532).

The spelling of 115222021 in words is "one hundred fifteen million, two hundred twenty-two thousand, twenty-one".