21159098 has 4 divisors (see below), whose sum is σ = 31738650. Its totient is φ = 10579548.

The previous prime is 21159091. The next prime is 21159109. The reversal of 21159098 is 89095112.

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., 12201049 + 8958049 = 3493^2 + 2993^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21159091) 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, 5289773 + ... + 5289776.

Almost surely, 2^21159098 is an apocalyptic number.

21159098 is a deficient number, since it is larger than the sum of its proper divisors (10579552).

21159098 is a wasteful number, since it uses less digits than its factorization.

21159098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10579551.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 21159098 is about 4599.9019554769. The cubic root of 21159098 is about 276.5873945884.

The spelling of 21159098 in words is "twenty-one million, one hundred fifty-nine thousand, ninety-eight".