21239298 has 12 divisors (see below), whose sum is σ = 46018518. Its totient is φ = 7079760.

The previous prime is 21239297. The next prime is 21239303. The reversal of 21239298 is 89293212.

It can be written as a sum of positive squares in only one way, i.e., 13638249 + 7601049 = 3693^2 + 2757^2 .

It is a super-2 number, since 2×21239298² = 902215559065608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21239297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589963 + ... + 589998.

Almost surely, 2^21239298 is an apocalyptic number.

21239298 is an abundant number, since it is smaller than the sum of its proper divisors (24779220).

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

21239298 is a wasteful number, since it uses less digits than its factorization.

21239298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179969 (or 1179966 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21239298 is about 4608.6112875789. The cubic root of 21239298 is about 276.9364066589.

The spelling of 21239298 in words is "twenty-one million, two hundred thirty-nine thousand, two hundred ninety-eight".