105210621161 has 4 divisors (see below), whose sum is σ = 105304309392. Its totient is φ = 105116932932.

The previous prime is 105210621121. The next prime is 105210621283. The reversal of 105210621161 is 161126012501.

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 105210621161 - 2³⁰ = 104136879337 is a prime.

It is a super-2 number, since 2×105210621161² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105210621161.

It is not an unprimeable number, because it can be changed into a prime (105210621101) 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, 46842431 + ... + 46844676.

It is an arithmetic number, because the mean of its divisors is an integer number (26326077348).

Almost surely, 2^105210621161 is an apocalyptic number.

It is an amenable number.

105210621161 is a deficient number, since it is larger than the sum of its proper divisors (93688231).

105210621161 is an equidigital number, since it uses as much as digits as its factorization.

105210621161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93688230.

The product of its (nonzero) digits is 720, while the sum is 26.

Adding to 105210621161 its reverse (161126012501), we get a palindrome (266336633662).

The spelling of 105210621161 in words is "one hundred five billion, two hundred ten million, six hundred twenty-one thousand, one hundred sixty-one".