105253021 has 4 divisors (see below), whose sum is σ = 105382044. Its totient is φ = 105124000.

The previous prime is 105253019. The next prime is 105253039. The reversal of 105253021 is 120352501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120352501 = 211 ⋅570391.

It can be written as a sum of positive squares in 2 ways, for example, as 57836025 + 47416996 = 7605^2 + 6886^2 .

It is a cyclic number.

It is not a de Polignac number, because 105253021 - 2¹ = 105253019 is a prime.

It is a super-2 number, since 2×105253021² = 22156396859252882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105253021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105253061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63280 + ... + 64921.

It is an arithmetic number, because the mean of its divisors is an integer number (26345511).

Almost surely, 2^105253021 is an apocalyptic number.

It is an amenable number.

105253021 is a deficient number, since it is larger than the sum of its proper divisors (129023).

105253021 is an equidigital number, since it uses as much as digits as its factorization.

105253021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129022.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 105253021 is about 10259.2894978161. The cubic root of 105253021 is about 472.1480387049.

The spelling of 105253021 in words is "one hundred five million, two hundred fifty-three thousand, twenty-one".