105551322121 has 4 divisors (see below), whose sum is σ = 120630082432. Its totient is φ = 90472561812.

The previous prime is 105551322119. The next prime is 105551322143. The reversal of 105551322121 is 121223155501.

It is a happy number.

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 105551322121 - 2¹ = 105551322119 is a prime.

It is a super-2 number, since 2×105551322121² (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 105551322121.

It is not an unprimeable number, because it can be changed into a prime (105551322181) 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, 7539380145 + ... + 7539380158.

It is an arithmetic number, because the mean of its divisors is an integer number (30157520608).

Almost surely, 2^105551322121 is an apocalyptic number.

It is an amenable number.

105551322121 is a deficient number, since it is larger than the sum of its proper divisors (15078760311).

105551322121 is an equidigital number, since it uses as much as digits as its factorization.

105551322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078760310.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 105551322121 its reverse (121223155501), we get a palindrome (226774477622).

The spelling of 105551322121 in words is "one hundred five billion, five hundred fifty-one million, three hundred twenty-two thousand, one hundred twenty-one".