21359198 has 24 divisors (see below), whose sum is σ = 37837512. Its totient is φ = 9014544.

The previous prime is 21359189. The next prime is 21359201. The reversal of 21359198 is 89195312.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4940 + ... + 8192.

It is an arithmetic number, because the mean of its divisors is an integer number (1576563).

Almost surely, 2^21359198 is an apocalyptic number.

21359198 is a deficient number, since it is larger than the sum of its proper divisors (16478314).

21359198 is a wasteful number, since it uses less digits than its factorization.

21359198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336 (or 3329 counting only the distinct ones).

The product of its digits is 19440, while the sum is 38.

The square root of 21359198 is about 4621.6012376664. The cubic root of 21359198 is about 277.4565492123.

The spelling of 21359198 in words is "twenty-one million, three hundred fifty-nine thousand, one hundred ninety-eight".