821940899898 has 16 divisors (see below), whose sum is σ = 1674898438176. Its totient is φ = 268810860240.

The previous prime is 821940899893. The next prime is 821940899921. The reversal of 821940899898 is 898998049128.

It is not an unprimeable number, because it can be changed into a prime (821940899893) 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, 1292359588 + ... + 1292360223.

It is an arithmetic number, because the mean of its divisors is an integer number (104681152386).

Almost surely, 2^821940899898 is an apocalyptic number.

821940899898 is an abundant number, since it is smaller than the sum of its proper divisors (852957538278).

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

821940899898 is a wasteful number, since it uses less digits than its factorization.

821940899898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584719869.

The product of its (nonzero) digits is 214990848, while the sum is 75.

The spelling of 821940899898 in words is "eight hundred twenty-one billion, nine hundred forty million, eight hundred ninety-nine thousand, eight hundred ninety-eight".