1221863044 has 12 divisors (see below), whose sum is σ = 2159020864. Its totient is φ = 604999944.

The previous prime is 1221863023. The next prime is 1221863051. The reversal of 1221863044 is 4403681221.

It is a junction number, because it is equal to n+sod(n) for n = 1221862997 and 1221863015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1482432 + ... + 1483255.

Almost surely, 2^1221863044 is an apocalyptic number.

It is an amenable number.

1221863044 is a deficient number, since it is larger than the sum of its proper divisors (937157820).

1221863044 is a wasteful number, since it uses less digits than its factorization.

1221863044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965794 (or 2965792 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 1221863044 is about 34955.1576165807. The cubic root of 1221863044 is about 1069.0733655121.

The spelling of 1221863044 in words is "one billion, two hundred twenty-one million, eight hundred sixty-three thousand, forty-four".