21812298 has 16 divisors (see below), whose sum is σ = 44115840. Its totient is φ = 7188896.

The previous prime is 21812279. The next prime is 21812353. The reversal of 21812298 is 89221812.

It is a super-3 number, since 3×21812298³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19890 + ... + 20957.

It is an arithmetic number, because the mean of its divisors is an integer number (2757240).

Almost surely, 2^21812298 is an apocalyptic number.

21812298 is an abundant number, since it is smaller than the sum of its proper divisors (22303542).

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

21812298 is a wasteful number, since it uses less digits than its factorization.

21812298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40941.

The product of its digits is 4608, while the sum is 33.

The square root of 21812298 is about 4670.3637973931. The cubic root of 21812298 is about 279.4047644319.

The spelling of 21812298 in words is "twenty-one million, eight hundred twelve thousand, two hundred ninety-eight".