1122112221 has 4 divisors (see below), whose sum is σ = 1496149632. Its totient is φ = 748074812.

The previous prime is 1122112207. The next prime is 1122112289. The reversal of 1122112221 is 1222112211.

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 a cyclic number.

It is not a de Polignac number, because 1122112221 - 2¹³ = 1122104029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1122112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122112021) 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, 187018701 + ... + 187018706.

It is an arithmetic number, because the mean of its divisors is an integer number (374037408).

Almost surely, 2^1122112221 is an apocalyptic number.

It is an amenable number.

1122112221 is a deficient number, since it is larger than the sum of its proper divisors (374037411).

1122112221 is an equidigital number, since it uses as much as digits as its factorization.

1122112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374037410.

The product of its digits is 32, while the sum is 15.

The square root of 1122112221 is about 33497.9435338947. The cubic root of 1122112221 is about 1039.1512493939.

Adding to 1122112221 its reverse (1222112211), we get a palindrome (2344224432).

The spelling of 1122112221 in words is "one billion, one hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".