1221678896 has 20 divisors (see below), whose sum is σ = 2417366112. Its totient is φ = 597842496.

The previous prime is 1221678893. The next prime is 1221678917. The reversal of 1221678896 is 6988761221.

It is not an unprimeable number, because it can be changed into a prime (1221678893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 811535 + ... + 813038.

Almost surely, 2^1221678896 is an apocalyptic number.

1221678896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1221678896 is a deficient number, since it is larger than the sum of its proper divisors (1195687216).

1221678896 is a wasteful number, since it uses less digits than its factorization.

1221678896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624628 (or 1624622 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 1221678896 is about 34952.5234568264. The cubic root of 1221678896 is about 1069.0196558338.

The spelling of 1221678896 in words is "one billion, two hundred twenty-one million, six hundred seventy-eight thousand, eight hundred ninety-six".