21013210213031 has 2 divisors, whose sum is σ = 21013210213032. Its totient is φ = 21013210213030.

The previous prime is 21013210213013. The next prime is 21013210213069. The reversal of 21013210213031 is 13031201231012.

It is a happy number.

Together with previous prime (21013210213013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21013210213031 - 2¹⁴ = 21013210196647 is a prime.

It is a super-2 number, since 2×21013210213031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21013210212994 and 21013210213012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013210213081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506605106515 + 10506605106516.

It is an arithmetic number, because the mean of its divisors is an integer number (10506605106516).

Almost surely, 2^{21013210213031} is an apocalyptic number.

21013210213031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013210213031 is an equidigital number, since it uses as much as digits as its factorization.

21013210213031 is an evil number, because the sum of its binary digits is even.

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

Adding to 21013210213031 its reverse (13031201231012), we get a palindrome (34044411444043).

The spelling of 21013210213031 in words is "twenty-one trillion, thirteen billion, two hundred ten million, two hundred thirteen thousand, thirty-one".