21868598 has 4 divisors (see below), whose sum is σ = 32802900. Its totient is φ = 10934298.

The previous prime is 21868597. The next prime is 21868603. The reversal of 21868598 is 89586812.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5467148 + ... + 5467151.

It is an arithmetic number, because the mean of its divisors is an integer number (8200725).

Almost surely, 2^21868598 is an apocalyptic number.

21868598 is a deficient number, since it is larger than the sum of its proper divisors (10934302).

21868598 is a wasteful number, since it uses less digits than its factorization.

21868598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10934301.

The product of its digits is 276480, while the sum is 47.

The square root of 21868598 is about 4676.3872807970. The cubic root of 21868598 is about 279.6449496332.

The spelling of 21868598 in words is "twenty-one million, eight hundred sixty-eight thousand, five hundred ninety-eight".