821217944292 has 96 divisors (see below), whose sum is σ = 2096471731200. Its totient is φ = 249202396800.

The previous prime is 821217944279. The next prime is 821217944297. The reversal of 821217944292 is 292449712128.

It is not an unprimeable number, because it can be changed into a prime (821217944297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1100817 + ... + 1689447.

It is an arithmetic number, because the mean of its divisors is an integer number (21838247200).

Almost surely, 2^821217944292 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821217944292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048235865600).

821217944292 is an abundant number, since it is smaller than the sum of its proper divisors (1275253786908).

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

821217944292 is a wasteful number, since it uses less digits than its factorization.

821217944292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588897 (or 588895 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The spelling of 821217944292 in words is "eight hundred twenty-one billion, two hundred seventeen million, nine hundred forty-four thousand, two hundred ninety-two".