1221122122 has 16 divisors (see below), whose sum is σ = 2000930400. Its totient is φ = 554297040.

The previous prime is 1221122099. The next prime is 1221122159. The reversal of 1221122122 is 2212211221.

It is a happy number.

It is a super-2 number, since 2×1221122122² = 2982278473675565768, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221122096 and 1221122105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21297 + ... + 53812.

It is an arithmetic number, because the mean of its divisors is an integer number (125058150).

Almost surely, 2^1221122122 is an apocalyptic number.

1221122122 is a deficient number, since it is larger than the sum of its proper divisors (779808278).

1221122122 is a wasteful number, since it uses less digits than its factorization.

1221122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75861.

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

The square root of 1221122122 is about 34944.5578309413. The cubic root of 1221122122 is about 1068.8572310497.

Adding to 1221122122 its reverse (2212211221), we get a palindrome (3433333343).

It can be divided in two parts, 12211221 and 22, that multiplied together give a palindrome (268646862).

The spelling of 1221122122 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-two".