105642031213 has 4 divisors (see below), whose sum is σ = 106084048320. Its totient is φ = 105200014108.

The previous prime is 105642031133. The next prime is 105642031217. The reversal of 105642031213 is 312130246501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 312130246501 = 3929 ⋅79442669.

It is a cyclic number.

It is not a de Polignac number, because 105642031213 - 2²⁹ = 105105160301 is a prime.

It is a super-2 number, since 2×105642031213² (a number of 23 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 (105642031217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221008195 + ... + 221008672.

It is an arithmetic number, because the mean of its divisors is an integer number (26521012080).

Almost surely, 2^105642031213 is an apocalyptic number.

It is an amenable number.

105642031213 is a deficient number, since it is larger than the sum of its proper divisors (442017107).

105642031213 is an equidigital number, since it uses as much as digits as its factorization.

105642031213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442017106.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 105642031213 its reverse (312130246501), we get a palindrome (417772277714).

The spelling of 105642031213 in words is "one hundred five billion, six hundred forty-two million, thirty-one thousand, two hundred thirteen".