21227098 has 4 divisors (see below), whose sum is σ = 31840650. Its totient is φ = 10613548.

The previous prime is 21227081. The next prime is 21227099. The reversal of 21227098 is 89072212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18292729 + 2934369 = 4277^2 + 1713^2 .

It is a Smith number, since the sum of its digits (31) 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 (21227099) 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 as a sum of consecutive naturals, namely, 5306773 + ... + 5306776.

Almost surely, 2^21227098 is an apocalyptic number.

21227098 is a deficient number, since it is larger than the sum of its proper divisors (10613552).

21227098 is a wasteful number, since it uses less digits than its factorization.

21227098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10613551.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21227098 is about 4607.2874883167. The cubic root of 21227098 is about 276.8833717725.

The spelling of 21227098 in words is "twenty-one million, two hundred twenty-seven thousand, ninety-eight".