21899498 has 8 divisors (see below), whose sum is σ = 32920992. Its totient is φ = 10925836.

The previous prime is 21899497. The next prime is 21899543. The reversal of 21899498 is 89499812.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21899491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10790 + ... + 12657.

It is an arithmetic number, because the mean of its divisors is an integer number (4115124).

Almost surely, 2^21899498 is an apocalyptic number.

21899498 is a deficient number, since it is larger than the sum of its proper divisors (11021494).

21899498 is a wasteful number, since it uses less digits than its factorization.

21899498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23916.

The product of its digits is 373248, while the sum is 50.

The square root of 21899498 is about 4679.6899469944. The cubic root of 21899498 is about 279.7765990154.

The spelling of 21899498 in words is "twenty-one million, eight hundred ninety-nine thousand, four hundred ninety-eight".