105121378 has 4 divisors (see below), whose sum is σ = 157682070. Its totient is φ = 52560688.

The previous prime is 105121351. The next prime is 105121381. The reversal of 105121378 is 873121501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 77316849 + 27804529 = 8793^2 + 5273^2 .

It is a super-2 number, since 2×105121378² = 22101008225237768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26280343 + ... + 26280346.

Almost surely, 2^105121378 is an apocalyptic number.

105121378 is a deficient number, since it is larger than the sum of its proper divisors (52560692).

105121378 is an equidigital number, since it uses as much as digits as its factorization.

105121378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52560691.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 105121378 is about 10252.8716952862. The cubic root of 105121378 is about 471.9511135091.

Adding to 105121378 its reverse (873121501), we get a palindrome (978242879).

The spelling of 105121378 in words is "one hundred five million, one hundred twenty-one thousand, three hundred seventy-eight".