821481912 has 48 divisors (see below), whose sum is σ = 2307254040. Its totient is φ = 273826656.

The previous prime is 821481893. The next prime is 821481953. The reversal of 821481912 is 219184128.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209343 + ... + 213230.

Almost surely, 2^821481912 is an apocalyptic number.

It is an amenable number.

821481912 is an abundant number, since it is smaller than the sum of its proper divisors (1485772128).

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

821481912 is a wasteful number, since it uses less digits than its factorization.

821481912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422594 (or 422578 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 821481912 is about 28661.5057524897. The cubic root of 821481912 is about 936.5536665112.

The spelling of 821481912 in words is "eight hundred twenty-one million, four hundred eighty-one thousand, nine hundred twelve".