1222322221 has 4 divisors (see below), whose sum is σ = 1222394944. Its totient is φ = 1222249500.

The previous prime is 1222322203. The next prime is 1222322237. The reversal of 1222322221 is 1222232221.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1222322221 - 2¹³ = 1222314029 is a prime.

It is a super-2 number, since 2×1222322221² = 2988143223900745682, 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 (1222322201) 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, 3196 + ... + 49546.

It is an arithmetic number, because the mean of its divisors is an integer number (305598736).

Almost surely, 2^1222322221 is an apocalyptic number.

It is an amenable number.

1222322221 is a deficient number, since it is larger than the sum of its proper divisors (72723).

1222322221 is an equidigital number, since it uses as much as digits as its factorization.

1222322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72722.

The product of its digits is 384, while the sum is 19.

The square root of 1222322221 is about 34961.7250861567. The cubic root of 1222322221 is about 1069.2072682500.

Adding to 1222322221 its reverse (1222232221), we get a palindrome (2444554442).

Subtracting from 1222322221 its reverse (1222232221), we obtain a square (90000 = 300²).

The spelling of 1222322221 in words is "one billion, two hundred twenty-two million, three hundred twenty-two thousand, two hundred twenty-one".