21313030123213 has 4 divisors (see below), whose sum is σ = 21381560767008. Its totient is φ = 21244499479420.

The previous prime is 21313030123211. The next prime is 21313030123381. The reversal of 21313030123213 is 31232103031312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21313030123213 - 2¹ = 21313030123211 is a prime.

It is a super-2 number, since 2×21313030123213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313030123211) 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, 34265321431 + ... + 34265322052.

It is an arithmetic number, because the mean of its divisors is an integer number (5345390191752).

Almost surely, 2^{21313030123213} is an apocalyptic number.

It is an amenable number.

21313030123213 is a deficient number, since it is larger than the sum of its proper divisors (68530643795).

21313030123213 is an equidigital number, since it uses as much as digits as its factorization.

21313030123213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68530643794.

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

Adding to 21313030123213 its reverse (31232103031312), we get a palindrome (52545133154525).

The spelling of 21313030123213 in words is "twenty-one trillion, three hundred thirteen billion, thirty million, one hundred twenty-three thousand, two hundred thirteen".