21113423013 has 8 divisors (see below), whose sum is σ = 28154478976. Its totient is φ = 14073991200.

The previous prime is 21113423011. The next prime is 21113423033. The reversal of 21113423013 is 31032431112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21113423013 - 2¹ = 21113423011 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113423011) by changing a digit.

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, 375373 + ... + 427938.

It is an arithmetic number, because the mean of its divisors is an integer number (3519309872).

Almost surely, 2^21113423013 is an apocalyptic number.

It is an amenable number.

21113423013 is a deficient number, since it is larger than the sum of its proper divisors (7041055963).

21113423013 is an equidigital number, since it uses as much as digits as its factorization.

21113423013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812075.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21113423013 its reverse (31032431112), we get a palindrome (52145854125).

The spelling of 21113423013 in words is "twenty-one billion, one hundred thirteen million, four hundred twenty-three thousand, thirteen".