1223154221 has 16 divisors (see below), whose sum is σ = 1266327744. Its totient is φ = 1180738944.

The previous prime is 1223154217. The next prime is 1223154223. The reversal of 1223154221 is 1224513221.

It is a cyclic number.

It is not a de Polignac number, because 1223154221 - 2² = 1223154217 is a prime.

It is a super-2 number, since 2×1223154221² = 2992212496700233682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223154223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2338466 + ... + 2338988.

It is an arithmetic number, because the mean of its divisors is an integer number (79145484).

Almost surely, 2^1223154221 is an apocalyptic number.

It is an amenable number.

1223154221 is a deficient number, since it is larger than the sum of its proper divisors (43173523).

1223154221 is a wasteful number, since it uses less digits than its factorization.

1223154221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100.

The product of its digits is 960, while the sum is 23.

The square root of 1223154221 is about 34973.6217884279. The cubic root of 1223154221 is about 1069.4498062297.

Adding to 1223154221 its reverse (1224513221), we get a palindrome (2447667442).

The spelling of 1223154221 in words is "one billion, two hundred twenty-three million, one hundred fifty-four thousand, two hundred twenty-one".