21113113430 has 16 divisors (see below), whose sum is σ = 38006060544. Its totient is φ = 8444699520.

The previous prime is 21113113387. The next prime is 21113113447. The reversal of 21113113430 is 3431131112.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 118574 + ... + 237246.

It is an arithmetic number, because the mean of its divisors is an integer number (2375378784).

Almost surely, 2^21113113430 is an apocalyptic number.

21113113430 is a deficient number, since it is larger than the sum of its proper divisors (16892947114).

21113113430 is a wasteful number, since it uses less digits than its factorization.

21113113430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136471.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21113113430 its reverse (3431131112), we get a palindrome (24544244542).

The spelling of 21113113430 in words is "twenty-one billion, one hundred thirteen million, one hundred thirteen thousand, four hundred thirty".