21594106 has 4 divisors (see below), whose sum is σ = 32391162. Its totient is φ = 10797052.

The previous prime is 21594101. The next prime is 21594107. The reversal of 21594106 is 60149512.

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., 21538881 + 55225 = 4641^2 + 235^2 .

It is not an unprimeable number, because it can be changed into a prime (21594101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5398525 + ... + 5398528.

Almost surely, 2^21594106 is an apocalyptic number.

21594106 is a deficient number, since it is larger than the sum of its proper divisors (10797056).

21594106 is a wasteful number, since it uses less digits than its factorization.

21594106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10797055.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21594106 is about 4646.9458787466. The cubic root of 21594106 is about 278.4699966711.

The spelling of 21594106 in words is "twenty-one million, five hundred ninety-four thousand, one hundred six".