821144172 has 24 divisors (see below), whose sum is σ = 1917164592. Its totient is φ = 273548800.

The previous prime is 821144143. The next prime is 821144173. The reversal of 821144172 is 271441128.

821144172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (821144173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772 + ... + 40532.

It is an arithmetic number, because the mean of its divisors is an integer number (79881858).

Almost surely, 2^821144172 is an apocalyptic number.

It is an amenable number.

821144172 is an abundant number, since it is smaller than the sum of its proper divisors (1096020420).

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

821144172 is a wasteful number, since it uses less digits than its factorization.

821144172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41489 (or 41487 counting only the distinct ones).

The product of its digits is 3584, while the sum is 30.

The square root of 821144172 is about 28655.6132720973. The cubic root of 821144172 is about 936.4252989073.

The spelling of 821144172 in words is "eight hundred twenty-one million, one hundred forty-four thousand, one hundred seventy-two".