1221418366 has 32 divisors (see below), whose sum is σ = 2109558528. Its totient is φ = 519557760.

The previous prime is 1221418349. The next prime is 1221418391. The reversal of 1221418366 is 6638141221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1899241 + ... + 1899883.

It is an arithmetic number, because the mean of its divisors is an integer number (65923704).

Almost surely, 2^1221418366 is an apocalyptic number.

1221418366 is a deficient number, since it is larger than the sum of its proper divisors (888140162).

1221418366 is a wasteful number, since it uses less digits than its factorization.

1221418366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456.

The product of its digits is 13824, while the sum is 34.

The square root of 1221418366 is about 34948.7963455110. The cubic root of 1221418366 is about 1068.9436589162.

Adding to 1221418366 its reverse (6638141221), we get a palindrome (7859559587).

The spelling of 1221418366 in words is "one billion, two hundred twenty-one million, four hundred eighteen thousand, three hundred sixty-six".