21113710 has 16 divisors (see below), whose sum is σ = 38573136. Its totient is φ = 8319168.

The previous prime is 21113707. The next prime is 21113723. The reversal of 21113710 is 1731112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15087 + ... + 16426.

It is an arithmetic number, because the mean of its divisors is an integer number (2410821).

Almost surely, 2^21113710 is an apocalyptic number.

21113710 is a deficient number, since it is larger than the sum of its proper divisors (17459426).

21113710 is a wasteful number, since it uses less digits than its factorization.

21113710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31587.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 21113710 is about 4594.9657234848. The cubic root of 21113710 is about 276.3894854644.

Adding to 21113710 its reverse (1731112), we get a palindrome (22844822).

The spelling of 21113710 in words is "twenty-one million, one hundred thirteen thousand, seven hundred ten".