821198311476 has 96 divisors (see below), whose sum is σ = 2118067273728. Its totient is φ = 246311493120.

The previous prime is 821198311447. The next prime is 821198311481. The reversal of 821198311476 is 674113891128.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10014121 + ... + 10095791.

It is an arithmetic number, because the mean of its divisors is an integer number (22063200768).

Almost surely, 2^821198311476 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 821198311476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1059033636864).

821198311476 is an abundant number, since it is smaller than the sum of its proper divisors (1296868962252).

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

821198311476 is a wasteful number, since it uses less digits than its factorization.

821198311476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83861 (or 83859 counting only the distinct ones).

The product of its digits is 580608, while the sum is 51.

The spelling of 821198311476 in words is "eight hundred twenty-one billion, one hundred ninety-eight million, three hundred eleven thousand, four hundred seventy-six".