21219498 has 24 divisors (see below), whose sum is σ = 46061028. Its totient is φ = 7060032.

The previous prime is 21219493. The next prime is 21219529. The reversal of 21219498 is 89491212.

It can be written as a sum of positive squares in 2 ways, for example, as 21040569 + 178929 = 4587^2 + 423^2 .

It is not an unprimeable number, because it can be changed into a prime (21219493) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 16536 + ... + 17772.

Almost surely, 2^21219498 is an apocalyptic number.

21219498 is an abundant number, since it is smaller than the sum of its proper divisors (24841530).

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

21219498 is a wasteful number, since it uses less digits than its factorization.

21219498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198 (or 2195 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 21219498 is about 4606.4626341695. The cubic root of 21219498 is about 276.8503233735.

The spelling of 21219498 in words is "twenty-one million, two hundred nineteen thousand, four hundred ninety-eight".