21232131331123 has 4 divisors (see below), whose sum is σ = 21234208239648. Its totient is φ = 21230054422600.

The previous prime is 21232131331121. The next prime is 21232131331181. The reversal of 21232131331123 is 32113313123212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21232131331123 - 2¹ = 21232131331121 is a prime.

It is a super-2 number, since 2×21232131331123² (a number of 27 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 = 21232131331091 and 21232131331100.

It is not an unprimeable number, because it can be changed into a prime (21232131331121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1038438928 + ... + 1038459373.

It is an arithmetic number, because the mean of its divisors is an integer number (5308552059912).

Almost surely, 2^{21232131331123} is an apocalyptic number.

21232131331123 is a deficient number, since it is larger than the sum of its proper divisors (2076908525).

21232131331123 is a wasteful number, since it uses less digits than its factorization.

21232131331123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076908524.

The product of its digits is 3888, while the sum is 28.

Adding to 21232131331123 its reverse (32113313123212), we get a palindrome (53345444454335).

The spelling of 21232131331123 in words is "twenty-one trillion, two hundred thirty-two billion, one hundred thirty-one million, three hundred thirty-one thousand, one hundred twenty-three".