105021057 has 4 divisors (see below), whose sum is σ = 140028080. Its totient is φ = 70014036.

The previous prime is 105021047. The next prime is 105021061. The reversal of 105021057 is 750120501.

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 not a de Polignac number, because 105021057 - 2¹⁴ = 105004673 is a prime.

It is a super-2 number, since 2×105021057² = 22058844826794498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105021047) 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, 17503507 + ... + 17503512.

It is an arithmetic number, because the mean of its divisors is an integer number (35007020).

Almost surely, 2^105021057 is an apocalyptic number.

It is an amenable number.

105021057 is a deficient number, since it is larger than the sum of its proper divisors (35007023).

105021057 is an equidigital number, since it uses as much as digits as its factorization.

105021057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35007022.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 105021057 is about 10247.9781908433. The cubic root of 105021057 is about 471.8009325847.

Adding to 105021057 its reverse (750120501), we get a palindrome (855141558).

The spelling of 105021057 in words is "one hundred five million, twenty-one thousand, fifty-seven".