1111212221 has 8 divisors (see below), whose sum is σ = 1270463040. Its totient is φ = 952087968.

The previous prime is 1111212203. The next prime is 1111212331. The reversal of 1111212221 is 1222121111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111212221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111212196 and 1111212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212121) 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, 12011 + ... + 48648.

It is an arithmetic number, because the mean of its divisors is an integer number (158807880).

Almost surely, 2^1111212221 is an apocalyptic number.

It is an amenable number.

1111212221 is a deficient number, since it is larger than the sum of its proper divisors (159250819).

1111212221 is an equidigital number, since it uses as much as digits as its factorization.

1111212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63283.

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

The square root of 1111212221 is about 33334.8499471649. The cubic root of 1111212221 is about 1035.7755848917.

Adding to 1111212221 its reverse (1222121111), we get a palindrome (2333333332).

The spelling of 1111212221 in words is "one billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-one".