21879598 has 16 divisors (see below), whose sum is σ = 35584416. Its totient is φ = 10029600.

The previous prime is 21879593. The next prime is 21879631. The reversal of 21879598 is 89597812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21879593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1140 + ... + 6712.

It is an arithmetic number, because the mean of its divisors is an integer number (2224026).

Almost surely, 2^21879598 is an apocalyptic number.

21879598 is a deficient number, since it is larger than the sum of its proper divisors (13704818).

21879598 is a wasteful number, since it uses less digits than its factorization.

21879598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739.

The product of its digits is 362880, while the sum is 49.

The square root of 21879598 is about 4677.5632545162. The cubic root of 21879598 is about 279.6918293162.

The spelling of 21879598 in words is "twenty-one million, eight hundred seventy-nine thousand, five hundred ninety-eight".