1221173832 has 32 divisors (see below), whose sum is σ = 3071674080. Its totient is φ = 404559360.

The previous prime is 1221173831. The next prime is 1221173839. The reversal of 1221173832 is 2383711221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221173832.

It is not an unprimeable number, because it can be changed into a prime (1221173831) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 152169 + ... + 159992.

It is an arithmetic number, because the mean of its divisors is an integer number (95989815).

Almost surely, 2^1221173832 is an apocalyptic number.

1221173832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221173832 is an abundant number, since it is smaller than the sum of its proper divisors (1850500248).

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

1221173832 is a wasteful number, since it uses less digits than its factorization.

1221173832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312333 (or 312329 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 1221173832 is about 34945.2977094201. The cubic root of 1221173832 is about 1068.8723182186.

The spelling of 1221173832 in words is "one billion, two hundred twenty-one million, one hundred seventy-three thousand, eight hundred thirty-two".