21858098 has 8 divisors (see below), whose sum is σ = 33236508. Its totient is φ = 10779264.

The previous prime is 21858029. The next prime is 21858127. The reversal of 21858098 is 89085812.

It can be written as a sum of positive squares in 2 ways, for example, as 20313049 + 1545049 = 4507^2 + 1243^2 .

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

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, 74711 + ... + 75002.

Almost surely, 2^21858098 is an apocalyptic number.

21858098 is a deficient number, since it is larger than the sum of its proper divisors (11378410).

21858098 is a wasteful number, since it uses less digits than its factorization.

21858098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149788.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 21858098 is about 4675.2644844971. The cubic root of 21858098 is about 279.6001861777.

The spelling of 21858098 in words is "twenty-one million, eight hundred fifty-eight thousand, ninety-eight".