821812492998 has 96 divisors (see below), whose sum is σ = 2039996814336. Its totient is φ = 234223614144.

The previous prime is 821812492997. The next prime is 821812493003. The reversal of 821812492998 is 899294218128.

821812492998 is a `hidden beast` number, since 8 + 21 + 81 + 249 + 299 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821812492997) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100621911 + ... + 100630077.

It is an arithmetic number, because the mean of its divisors is an integer number (21249966816).

Almost surely, 2^821812492998 is an apocalyptic number.

821812492998 is an abundant number, since it is smaller than the sum of its proper divisors (1218184321338).

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

821812492998 is a wasteful number, since it uses less digits than its factorization.

821812492998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10058 (or 10055 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The spelling of 821812492998 in words is "eight hundred twenty-one billion, eight hundred twelve million, four hundred ninety-two thousand, nine hundred ninety-eight".