21795898 has 8 divisors (see below), whose sum is σ = 33248160. Its totient is φ = 10713180.

The previous prime is 21795857. The next prime is 21795899. The reversal of 21795898 is 89859712.

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

It is a super-2 number, since 2×21795898² = 950122339252808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21795899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92238 + ... + 92473.

It is an arithmetic number, because the mean of its divisors is an integer number (4156020).

Almost surely, 2^21795898 is an apocalyptic number.

21795898 is a deficient number, since it is larger than the sum of its proper divisors (11452262).

21795898 is a wasteful number, since it uses less digits than its factorization.

21795898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184772.

The product of its digits is 362880, while the sum is 49.

The square root of 21795898 is about 4668.6077153687. The cubic root of 21795898 is about 279.3347215745.

The spelling of 21795898 in words is "twenty-one million, seven hundred ninety-five thousand, eight hundred ninety-eight".