1221418626 has 16 divisors (see below), whose sum is σ = 2476301664. Its totient is φ = 401562144.

The previous prime is 1221418619. The next prime is 1221418651. The reversal of 1221418626 is 6268141221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1393876 + ... + 1394751.

It is an arithmetic number, because the mean of its divisors is an integer number (154768854).

Almost surely, 2^1221418626 is an apocalyptic number.

1221418626 is an abundant number, since it is smaller than the sum of its proper divisors (1254883038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221418626 is a wasteful number, since it uses less digits than its factorization.

1221418626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788705.

The product of its digits is 9216, while the sum is 33.

The square root of 1221418626 is about 34948.8000652383. The cubic root of 1221418626 is about 1068.9437347639.

Adding to 1221418626 its reverse (6268141221), we get a palindrome (7489559847).

The spelling of 1221418626 in words is "one billion, two hundred twenty-one million, four hundred eighteen thousand, six hundred twenty-six".