21112134431 has 8 divisors (see below), whose sum is σ = 21269780064. Its totient is φ = 20955074560.

The previous prime is 21112134413. The next prime is 21112134457. The reversal of 21112134431 is 13443121112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112134431 is a prime.

It is a super-2 number, since 2×21112134431² (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 = 21112134397 and 21112134406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112134331) 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, 73955 + ... + 218388.

It is an arithmetic number, because the mean of its divisors is an integer number (2658722508).

Almost surely, 2^21112134431 is an apocalyptic number.

21112134431 is a deficient number, since it is larger than the sum of its proper divisors (157645633).

21112134431 is a wasteful number, since it uses less digits than its factorization.

21112134431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292881.

The product of its digits is 576, while the sum is 23.

Adding to 21112134431 its reverse (13443121112), we get a palindrome (34555255543).

The spelling of 21112134431 in words is "twenty-one billion, one hundred twelve million, one hundred thirty-four thousand, four hundred thirty-one".