21112122131 has 8 divisors (see below), whose sum is σ = 21639278304. Its totient is φ = 20589736960.

The previous prime is 21112122127. The next prime is 21112122149. The reversal of 21112122131 is 13122121112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21112122131 - 2² = 21112122127 is a prime.

It is a super-2 number, since 2×21112122131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112122151) 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, 1183790 + ... + 1201491.

It is an arithmetic number, because the mean of its divisors is an integer number (2704909788).

Almost surely, 2^21112122131 is an apocalyptic number.

21112122131 is a deficient number, since it is larger than the sum of its proper divisors (527156173).

21112122131 is a wasteful number, since it uses less digits than its factorization.

21112122131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385501.

The product of its digits is 48, while the sum is 17.

Adding to 21112122131 its reverse (13122121112), we get a palindrome (34234243243).

The spelling of 21112122131 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, one hundred thirty-one".