21230131123 has 8 divisors (see below), whose sum is σ = 22240209600. Its totient is φ = 20238586368.

The previous prime is 21230131121. The next prime is 21230131127. The reversal of 21230131123 is 32113103212.

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 21230131123 - 2¹ = 21230131121 is a prime.

It is a super-3 number, since 3×21230131123³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21230131123.

It is not an unprimeable number, because it can be changed into a prime (21230131121) 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, 4631086 + ... + 4635667.

It is an arithmetic number, because the mean of its divisors is an integer number (2780026200).

Almost surely, 2^21230131123 is an apocalyptic number.

21230131123 is a deficient number, since it is larger than the sum of its proper divisors (1010078477).

21230131123 is an equidigital number, since it uses as much as digits as its factorization.

21230131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9266861.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21230131123 its reverse (32113103212), we get a palindrome (53343234335).

The spelling of 21230131123 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-one thousand, one hundred twenty-three".