21013313232031 has 4 divisors (see below), whose sum is σ = 22249390480992. Its totient is φ = 19777235983072.

The previous prime is 21013313232019. The next prime is 21013313232071. The reversal of 21013313232031 is 13023231331012.

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 21013313232031 - 2¹¹ = 21013313229983 is a prime.

It is a super-2 number, since 2×21013313232031² (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 = 21013313231987 and 21013313232005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013313232071) 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, 618038624455 + ... + 618038624488.

It is an arithmetic number, because the mean of its divisors is an integer number (5562347620248).

Almost surely, 2^{21013313232031} is an apocalyptic number.

21013313232031 is a deficient number, since it is larger than the sum of its proper divisors (1236077248961).

21013313232031 is a wasteful number, since it uses less digits than its factorization.

21013313232031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236077248960.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21013313232031 its reverse (13023231331012), we get a palindrome (34036544563043).

The spelling of 21013313232031 in words is "twenty-one trillion, thirteen billion, three hundred thirteen million, two hundred thirty-two thousand, thirty-one".