1121222221 has 8 divisors (see below), whose sum is σ = 1285772544. Its totient is φ = 957765840.

The previous prime is 1121222213. The next prime is 1121222227. The reversal of 1121222221 is 1222221211.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1121222221 - 2³ = 1121222213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121222195 and 1121222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121222227) 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, 271285 + ... + 275386.

It is an arithmetic number, because the mean of its divisors is an integer number (160721568).

Almost surely, 2^1121222221 is an apocalyptic number.

It is an amenable number.

1121222221 is a deficient number, since it is larger than the sum of its proper divisors (164550323).

1121222221 is an equidigital number, since it uses as much as digits as its factorization.

1121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546971.

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

The square root of 1121222221 is about 33484.6565011499. The cubic root of 1121222221 is about 1038.8764434773.

Adding to 1121222221 its reverse (1222221211), we get a palindrome (2343443432).

It can be divided in two parts, 11212 and 22221, that added together give a palindrome (33433).

The spelling of 1121222221 in words is "one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".