1122111221 has 24 divisors (see below), whose sum is σ = 1430353440. Its totient is φ = 870458400.

The previous prime is 1122111209. The next prime is 1122111233. The reversal of 1122111221 is 1221112211.

It is an interprime number because it is at equal distance from previous prime (1122111209) and next prime (1122111233).

It is not a de Polignac number, because 1122111221 - 2²⁶ = 1055002357 is a prime.

It is a super-2 number, since 2×1122111221² = 2518267184588221682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1122111196 and 1122111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122111271) 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, 118886 + ... + 127976.

It is an arithmetic number, because the mean of its divisors is an integer number (59598060).

Almost surely, 2^1122111221 is an apocalyptic number.

1122111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1122111221 is a deficient number, since it is larger than the sum of its proper divisors (308242219).

1122111221 is a wasteful number, since it uses less digits than its factorization.

1122111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9345 (or 9338 counting only the distinct ones).

The product of its digits is 16, while the sum is 14.

The square root of 1122111221 is about 33497.9286076020. The cubic root of 1122111221 is about 1039.1509407048.

Adding to 1122111221 its reverse (1221112211), we get a palindrome (2343223432).

The spelling of 1122111221 in words is "one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".