21231112230031 has 4 divisors (see below), whose sum is σ = 23161213341864. Its totient is φ = 19301011118200.

The previous prime is 21231112230007. The next prime is 21231112230103. The reversal of 21231112230031 is 13003221113212.

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 21231112230031 - 2³¹ = 21228964746383 is a prime.

It is a super-2 number, since 2×21231112230031² (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 = 21231112229984 and 21231112230011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231112230931) 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, 965050555900 + ... + 965050555921.

It is an arithmetic number, because the mean of its divisors is an integer number (5790303335466).

Almost surely, 2^{21231112230031} is an apocalyptic number.

21231112230031 is a deficient number, since it is larger than the sum of its proper divisors (1930101111833).

21231112230031 is a wasteful number, since it uses less digits than its factorization.

21231112230031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930101111832.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21231112230031 its reverse (13003221113212), we get a palindrome (34234333343243).

The spelling of 21231112230031 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred twelve million, two hundred thirty thousand, thirty-one".