105121212242 has 6 divisors (see below), whose sum is σ = 157682506149. Its totient is φ = 52560376860.

The previous prime is 105121212241. The next prime is 105121212263. The reversal of 105121212242 is 242212121501.

It can be written as a sum of positive squares in 2 ways, for example, as 79547125681 + 25574086561 = 282041^2 + 159919^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=229261.

It is a super-2 number, since 2×105121212242² (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 (105121212241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 343892 + ... + 573152.

Almost surely, 2^105121212242 is an apocalyptic number.

105121212242 is a deficient number, since it is larger than the sum of its proper divisors (52561293907).

105121212242 is an frugal number, since it uses more digits than its factorization.

105121212242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458524 (or 229263 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 105121212242 its reverse (242212121501), we get a palindrome (347333333743).

The spelling of 105121212242 in words is "one hundred five billion, one hundred twenty-one million, two hundred twelve thousand, two hundred forty-two".