105121345 has 16 divisors (see below), whose sum is σ = 144380160. Its totient is φ = 71976384.

The previous prime is 105121327. The next prime is 105121351. The reversal of 105121345 is 543121501.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 105121345 - 2²¹ = 103024193 is a prime.

It is a super-2 number, since 2×105121345² = 22100994349218050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27204 + ... + 30826.

It is an arithmetic number, because the mean of its divisors is an integer number (9023760).

Almost surely, 2^105121345 is an apocalyptic number.

It is an amenable number.

105121345 is a deficient number, since it is larger than the sum of its proper divisors (39258815).

105121345 is an equidigital number, since it uses as much as digits as its factorization.

105121345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 105121345 is about 10252.8700859808. The cubic root of 105121345 is about 471.9510641237.

Adding to 105121345 its reverse (543121501), we get a palindrome (648242846).

The spelling of 105121345 in words is "one hundred five million, one hundred twenty-one thousand, three hundred forty-five".