1221882899 has 4 divisors (see below), whose sum is σ = 1232696136. Its totient is φ = 1211069664.

The previous prime is 1221882877. The next prime is 1221882901. The reversal of 1221882899 is 9982881221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9982881221 = 523 ⋅19087727.

It is a cyclic number.

It is not a de Polignac number, because 1221882899 - 2²⁰ = 1220834323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221884899) 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, 5406449 + ... + 5406674.

It is an arithmetic number, because the mean of its divisors is an integer number (308174034).

Almost surely, 2^1221882899 is an apocalyptic number.

1221882899 is a deficient number, since it is larger than the sum of its proper divisors (10813237).

1221882899 is a wasteful number, since it uses less digits than its factorization.

1221882899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10813236.

The product of its digits is 331776, while the sum is 50.

The square root of 1221882899 is about 34955.4416221566. The cubic root of 1221882899 is about 1069.0791562148.

The spelling of 1221882899 in words is "one billion, two hundred twenty-one million, eight hundred eighty-two thousand, eight hundred ninety-nine".