21872598 has 64 divisors (see below), whose sum is σ = 50077440. Its totient is φ = 6310400.

The previous prime is 21872597. The next prime is 21872603. The reversal of 21872598 is 89527812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21872593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159586 + ... + 159722.

It is an arithmetic number, because the mean of its divisors is an integer number (782460).

Almost surely, 2^21872598 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21872598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25038720).

21872598 is an abundant number, since it is smaller than the sum of its proper divisors (28204842).

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

21872598 is a wasteful number, since it uses less digits than its factorization.

21872598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253.

The product of its digits is 80640, while the sum is 42.

The square root of 21872598 is about 4676.8149418167. The cubic root of 21872598 is about 279.6619986091.

The spelling of 21872598 in words is "twenty-one million, eight hundred seventy-two thousand, five hundred ninety-eight".