21230998 has 8 divisors (see below), whose sum is σ = 31866192. Its totient is φ = 10608936.

The previous prime is 21230969. The next prime is 21231029. The reversal of 21230998 is 89903212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3936 + ... + 7612.

It is an arithmetic number, because the mean of its divisors is an integer number (3983274).

Almost surely, 2^21230998 is an apocalyptic number.

21230998 is a deficient number, since it is larger than the sum of its proper divisors (10635194).

21230998 is a wasteful number, since it uses less digits than its factorization.

21230998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6566.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 21230998 is about 4607.7107114054. The cubic root of 21230998 is about 276.9003277569.

The spelling of 21230998 in words is "twenty-one million, two hundred thirty thousand, nine hundred ninety-eight".