210105457 has 4 divisors (see below), whose sum is σ = 212033140. Its totient is φ = 208177776.

The previous prime is 210105451. The next prime is 210105473. The reversal of 210105457 is 754501012.

210105457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 181279296 + 28826161 = 13464^2 + 5369^2 .

It is a cyclic number.

It is not a de Polignac number, because 210105457 - 2³ = 210105449 is a prime.

It is a super-2 number, since 2×210105457² = 88288606122357698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210105451) 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, 963678 + ... + 963895.

It is an arithmetic number, because the mean of its divisors is an integer number (53008285).

Almost surely, 2^210105457 is an apocalyptic number.

It is an amenable number.

210105457 is a deficient number, since it is larger than the sum of its proper divisors (1927683).

210105457 is a wasteful number, since it uses less digits than its factorization.

210105457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927682.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 210105457 is about 14495.0149016826. The cubic root of 210105457 is about 594.4916751621.

Adding to 210105457 its reverse (754501012), we get a palindrome (964606469).

The spelling of 210105457 in words is "two hundred ten million, one hundred five thousand, four hundred fifty-seven".