1221953232 has 120 divisors (see below), whose sum is σ = 3370575936. Its totient is φ = 381376512.

The previous prime is 1221953221. The next prime is 1221953237. The reversal of 1221953232 is 2323591221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221953232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221953237) 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 23 ways as a sum of consecutive naturals, for example, 1680453 + ... + 1681179.

Almost surely, 2^1221953232 is an apocalyptic number.

1221953232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221953232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1685287968).

1221953232 is an abundant number, since it is smaller than the sum of its proper divisors (2148622704).

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

1221953232 is a wasteful number, since it uses less digits than its factorization.

1221953232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 848 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 1221953232 is about 34956.4476456061. The cubic root of 1221953232 is about 1069.0996683008.

The spelling of 1221953232 in words is "one billion, two hundred twenty-one million, nine hundred fifty-three thousand, two hundred thirty-two".