21311223030031 has 4 divisors (see below), whose sum is σ = 23248606941864. Its totient is φ = 19373839118200.

The previous prime is 21311223030029. The next prime is 21311223030043. The reversal of 21311223030031 is 13003032211312.

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 21311223030031 - 2¹ = 21311223030029 is a prime.

It is a super-2 number, since 2×21311223030031² (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 = 21311223029984 and 21311223030011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311223030931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968691955900 + ... + 968691955921.

It is an arithmetic number, because the mean of its divisors is an integer number (5812151735466).

Almost surely, 2^{21311223030031} is an apocalyptic number.

21311223030031 is a deficient number, since it is larger than the sum of its proper divisors (1937383911833).

21311223030031 is a wasteful number, since it uses less digits than its factorization.

21311223030031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937383911832.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21311223030031 its reverse (13003032211312), we get a palindrome (34314255241343).

The spelling of 21311223030031 in words is "twenty-one trillion, three hundred eleven billion, two hundred twenty-three million, thirty thousand, thirty-one".