21394898 has 16 divisors (see below), whose sum is σ = 37860864. Its totient is φ = 8873280.

The previous prime is 21394897. The next prime is 21394903. The reversal of 21394898 is 89849312.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21394897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24215 + ... + 25082.

It is an arithmetic number, because the mean of its divisors is an integer number (2366304).

Almost surely, 2^21394898 is an apocalyptic number.

21394898 is a deficient number, since it is larger than the sum of its proper divisors (16465966).

21394898 is a wasteful number, since it uses less digits than its factorization.

21394898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49337.

The product of its digits is 124416, while the sum is 44.

The square root of 21394898 is about 4625.4619228786. The cubic root of 21394898 is about 277.6110444852.

The spelling of 21394898 in words is "twenty-one million, three hundred ninety-four thousand, eight hundred ninety-eight".