1221849963 has 24 divisors (see below), whose sum is σ = 1785288960. Its totient is φ = 805183920.

The previous prime is 1221849931. The next prime is 1221849971. The reversal of 1221849963 is 3699481221.

It is not a de Polignac number, because 1221849963 - 2⁵ = 1221849931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221849913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 776968 + ... + 778538.

It is an arithmetic number, because the mean of its divisors is an integer number (74387040).

Almost surely, 2^1221849963 is an apocalyptic number.

1221849963 is a deficient number, since it is larger than the sum of its proper divisors (563438997).

1221849963 is a wasteful number, since it uses less digits than its factorization.

1221849963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519 (or 2516 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 1221849963 is about 34954.9705049225. The cubic root of 1221849963 is about 1069.0695504095.

The spelling of 1221849963 in words is "one billion, two hundred twenty-one million, eight hundred forty-nine thousand, nine hundred sixty-three".