21112430 has 16 divisors (see below), whose sum is σ = 38078640. Its totient is φ = 8428032.

The previous prime is 21112411. The next prime is 21112433. The reversal of 21112430 is 3421112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3941 + ... + 7599.

It is an arithmetic number, because the mean of its divisors is an integer number (2379915).

Almost surely, 2^21112430 is an apocalyptic number.

21112430 is a deficient number, since it is larger than the sum of its proper divisors (16966210).

21112430 is a wasteful number, since it uses less digits than its factorization.

21112430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4243.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21112430 is about 4594.8264385067. The cubic root of 21112430 is about 276.3839000621.

Adding to 21112430 its reverse (3421112), we get a palindrome (24533542).

The spelling of 21112430 in words is "twenty-one million, one hundred twelve thousand, four hundred thirty".