21113423031 has 8 divisors (see below), whose sum is σ = 28207648000. Its totient is φ = 14047406712.

The previous prime is 21113423011. The next prime is 21113423033. The reversal of 21113423031 is 13032431112.

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

It is not a de Polignac number, because 21113423031 - 2⁷ = 21113422903 is a prime.

It is a super-2 number, since 2×21113423031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113422989 and 21113423007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113423033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7050415 + ... + 7053408.

It is an arithmetic number, because the mean of its divisors is an integer number (3525956000).

Almost surely, 2^21113423031 is an apocalyptic number.

21113423031 is a deficient number, since it is larger than the sum of its proper divisors (7094224969).

21113423031 is a wasteful number, since it uses less digits than its factorization.

21113423031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14104325.

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

Adding to 21113423031 its reverse (13032431112), we get a palindrome (34145854143).

The spelling of 21113423031 in words is "twenty-one billion, one hundred thirteen million, four hundred twenty-three thousand, thirty-one".