1122122221 has 24 divisors (see below), whose sum is σ = 1278634464. Its totient is φ = 976500000.

The previous prime is 1122122207. The next prime is 1122122263. The reversal of 1122122221 is 1222212211.

It is a happy number.

It is not a de Polignac number, because 1122122221 - 2⁵ = 1122122189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1122122195 and 1122122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122122821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1067146 + ... + 1068196.

It is an arithmetic number, because the mean of its divisors is an integer number (53276436).

Almost surely, 2^1122122221 is an apocalyptic number.

1122122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1122122221 is a deficient number, since it is larger than the sum of its proper divisors (156512243).

1122122221 is a wasteful number, since it uses less digits than its factorization.

1122122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1194 counting only the distinct ones).

The product of its digits is 64, while the sum is 16.

The square root of 1122122221 is about 33498.0927964563. The cubic root of 1122122221 is about 1039.1543362752.

Adding to 1122122221 its reverse (1222212211), we get a palindrome (2344334432).

The spelling of 1122122221 in words is "one billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".