21013223011031 has 4 divisors (see below), whose sum is σ = 21013352098200. Its totient is φ = 21013093923864.

The previous prime is 21013223011003. The next prime is 21013223011043. The reversal of 21013223011031 is 13011032231012.

It is a happy number.

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 21013223011031 - 2²² = 21013218816727 is a prime.

It is a super-2 number, since 2×21013223011031² (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 = 21013223010994 and 21013223011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013223011051) 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, 64299101 + ... + 64625078.

It is an arithmetic number, because the mean of its divisors is an integer number (5253338024550).

Almost surely, 2^{21013223011031} is an apocalyptic number.

21013223011031 is a deficient number, since it is larger than the sum of its proper divisors (129087169).

21013223011031 is a wasteful number, since it uses less digits than its factorization.

21013223011031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129087168.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21013223011031 its reverse (13011032231012), we get a palindrome (34024255242043).

The spelling of 21013223011031 in words is "twenty-one trillion, thirteen billion, two hundred twenty-three million, eleven thousand, thirty-one".