99784920212 has 12 divisors (see below), whose sum is σ = 174633781140. Its totient is φ = 49889554176.

The previous prime is 99784920163. The next prime is 99784920217. The reversal of 99784920212 is 21202948799.

It can be written as a sum of positive squares in 2 ways, for example, as 46347200656 + 53437719556 = 215284^2 + 231166^2 .

It is a super-2 number, since 2×99784920212² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99784920217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648287 + ... + 787302.

It is an arithmetic number, because the mean of its divisors is an integer number (14552815095).

Almost surely, 2^99784920212 is an apocalyptic number.

It is an amenable number.

99784920212 is a deficient number, since it is larger than the sum of its proper divisors (74848860928).

99784920212 is a wasteful number, since it uses less digits than its factorization.

99784920212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452970 (or 1452968 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 99784920212 in words is "ninety-nine billion, seven hundred eighty-four million, nine hundred twenty thousand, two hundred twelve".