822258221 has 4 divisors (see below), whose sum is σ = 823502844. Its totient is φ = 821013600.

The previous prime is 822258209. The next prime is 822258251. The reversal of 822258221 is 122852228.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 292752100 + 529506121 = 17110^2 + 23011^2 .

It is a cyclic number.

It is not a de Polignac number, because 822258221 - 2¹⁰ = 822257197 is a prime.

It is a super-2 number, since 2×822258221² = 1352217164004169682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (822258251) 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, 621320 + ... + 622641.

It is an arithmetic number, because the mean of its divisors is an integer number (205875711).

Almost surely, 2^822258221 is an apocalyptic number.

It is an amenable number.

822258221 is a deficient number, since it is larger than the sum of its proper divisors (1244623).

822258221 is a wasteful number, since it uses less digits than its factorization.

822258221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244622.

The product of its digits is 10240, while the sum is 32.

The square root of 822258221 is about 28675.0452658753. The cubic root of 822258221 is about 936.8485912989.

The spelling of 822258221 in words is "eight hundred twenty-two million, two hundred fifty-eight thousand, two hundred twenty-one".