21159146 has 4 divisors (see below), whose sum is σ = 31738722. Its totient is φ = 10579572.

The previous prime is 21159133. The next prime is 21159161. The reversal of 21159146 is 64195112.

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., 13402921 + 7756225 = 3661^2 + 2785^2 .

It is an unprimeable number.

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, 5289785 + ... + 5289788.

Almost surely, 2^21159146 is an apocalyptic number.

21159146 is a deficient number, since it is larger than the sum of its proper divisors (10579576).

21159146 is a wasteful number, since it uses less digits than its factorization.

21159146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10579575.

The product of its digits is 2160, while the sum is 29.

The square root of 21159146 is about 4599.9071729764. The cubic root of 21159146 is about 276.5876037370.

The spelling of 21159146 in words is "twenty-one million, one hundred fifty-nine thousand, one hundred forty-six".