21900598 has 4 divisors (see below), whose sum is σ = 32850900. Its totient is φ = 10950298.

The previous prime is 21900583. The next prime is 21900649. The reversal of 21900598 is 89500912.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5475148 + ... + 5475151.

It is an arithmetic number, because the mean of its divisors is an integer number (8212725).

Almost surely, 2^21900598 is an apocalyptic number.

21900598 is a deficient number, since it is larger than the sum of its proper divisors (10950302).

21900598 is a wasteful number, since it uses less digits than its factorization.

21900598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950301.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 21900598 is about 4679.8074746724. The cubic root of 21900598 is about 279.7812832797.

The spelling of 21900598 in words is "twenty-one million, nine hundred thousand, five hundred ninety-eight".