105631421305 has 8 divisors (see below), whose sum is σ = 129149360712. Its totient is φ = 82910700288.

The previous prime is 105631421281. The next prime is 105631421309. The reversal of 105631421305 is 503124136501.

It can be written as a sum of positive squares in 4 ways, for example, as 20919572496 + 84711848809 = 144636^2 + 291053^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 105631421305 - 2¹⁹ = 105630897017 is a prime.

It is a super-2 number, since 2×105631421305² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105631421309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199304304 + ... + 199304833.

It is an arithmetic number, because the mean of its divisors is an integer number (16143670089).

Almost surely, 2^105631421305 is an apocalyptic number.

It is an amenable number.

105631421305 is a deficient number, since it is larger than the sum of its proper divisors (23517939407).

105631421305 is an equidigital number, since it uses as much as digits as its factorization.

105631421305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398609195.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 105631421305 its reverse (503124136501), we get a palindrome (608755557806).

The spelling of 105631421305 in words is "one hundred five billion, six hundred thirty-one million, four hundred twenty-one thousand, three hundred five".