1122121221 has 8 divisors (see below), whose sum is σ = 1611251040. Its totient is φ = 690536112.

The previous prime is 1122121213. The next prime is 1122121223. The reversal of 1122121221 is 1221212211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1122121221 - 2³ = 1122121213 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1122121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14386131 + ... + 14386208.

It is an arithmetic number, because the mean of its divisors is an integer number (201406380).

Almost surely, 2^1122121221 is an apocalyptic number.

It is an amenable number.

1122121221 is a deficient number, since it is larger than the sum of its proper divisors (489129819).

1122121221 is a wasteful number, since it uses less digits than its factorization.

1122121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28772355.

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

The square root of 1122121221 is about 33498.0778702301. The cubic root of 1122121221 is about 1039.1540275879.

Adding to 1122121221 its reverse (1221212211), we get a palindrome (2343333432).

The spelling of 1122121221 in words is "one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".