21160406 has 4 divisors (see below), whose sum is σ = 31740612. Its totient is φ = 10580202.

The previous prime is 21160397. The next prime is 21160439. The reversal of 21160406 is 60406112.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5290100 + ... + 5290103.

It is an arithmetic number, because the mean of its divisors is an integer number (7935153).

Almost surely, 2^21160406 is an apocalyptic number.

21160406 is a deficient number, since it is larger than the sum of its proper divisors (10580206).

21160406 is a wasteful number, since it uses less digits than its factorization.

21160406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580205.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21160406 is about 4600.0441302231. The cubic root of 21160406 is about 276.5930937737.

Adding to 21160406 its reverse (60406112), we get a palindrome (81566518).

The spelling of 21160406 in words is "twenty-one million, one hundred sixty thousand, four hundred six".