21130670 has 16 divisors (see below), whose sum is σ = 41493168. Its totient is φ = 7683840.

The previous prime is 21130667. The next prime is 21130699. The reversal of 21130670 is 7603112.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 95939 + ... + 96158.

It is an arithmetic number, because the mean of its divisors is an integer number (2593323).

Almost surely, 2^21130670 is an apocalyptic number.

21130670 is a deficient number, since it is larger than the sum of its proper divisors (20362498).

21130670 is a wasteful number, since it uses less digits than its factorization.

21130670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192115.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21130670 is about 4596.8108510140. The cubic root of 21130670 is about 276.4634707423.

Adding to 21130670 its reverse (7603112), we get a palindrome (28733782).

The spelling of 21130670 in words is "twenty-one million, one hundred thirty thousand, six hundred seventy".