99212500 has 36 divisors (see below), whose sum is σ = 217040796. Its totient is φ = 39680000.

The previous prime is 99212417. The next prime is 99212507. The reversal of 99212500 is 521299.

It can be written as a sum of positive squares in 6 ways, for example, as 50296464 + 48916036 = 7092^2 + 6994^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99212507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8532 + ... + 16468.

It is an arithmetic number, because the mean of its divisors is an integer number (6028911).

Almost surely, 2^99212500 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 99212500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108520398).

99212500 is an abundant number, since it is smaller than the sum of its proper divisors (117828296).

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

99212500 is an equidigital number, since it uses as much as digits as its factorization.

99212500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7966 (or 7944 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 99212500 is about 9960.5471737249. The cubic root of 99212500 is about 462.9372538810.

Adding to 99212500 its reverse (521299), we get a palindrome (99733799).

It can be divided in two parts, 9921 and 2500, that added together give a palindrome (12421).

The spelling of 99212500 in words is "ninety-nine million, two hundred twelve thousand, five hundred".