21001233210031 has 2 divisors, whose sum is σ = 21001233210032. Its totient is φ = 21001233210030.

The previous prime is 21001233210029. The next prime is 21001233210149. The reversal of 21001233210031 is 13001233210012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001233210031 - 2¹ = 21001233210029 is a prime.

It is a super-3 number, since 3×21001233210031³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 21001233210029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21001233209990 and 21001233210008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001233210011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500616605015 + 10500616605016.

It is an arithmetic number, because the mean of its divisors is an integer number (10500616605016).

Almost surely, 2^{21001233210031} is an apocalyptic number.

21001233210031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001233210031 is an equidigital number, since it uses as much as digits as its factorization.

21001233210031 is an odious number, because the sum of its binary digits is odd.

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

Subtracting from 21001233210031 its sum of digits (19), we obtain a palindrome (21001233210012).

Adding to 21001233210031 its reverse (13001233210012), we get a palindrome (34002466420043).

The spelling of 21001233210031 in words is "twenty-one trillion, one billion, two hundred thirty-three million, two hundred ten thousand, thirty-one".