105202021 has 4 divisors (see below), whose sum is σ = 105287500. Its totient is φ = 105116544.

The previous prime is 105202007. The next prime is 105202033. The reversal of 105202021 is 120202501.

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 22137025 + 83064996 = 4705^2 + 9114^2 .

It is a cyclic number.

It is not a de Polignac number, because 105202021 - 2¹⁷ = 105070949 is a prime.

It is a super-2 number, since 2×105202021² = 22134930444968882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105201992 and 105202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105202051) 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, 40866 + ... + 43363.

It is an arithmetic number, because the mean of its divisors is an integer number (26321875).

Almost surely, 2^105202021 is an apocalyptic number.

It is an amenable number.

105202021 is a deficient number, since it is larger than the sum of its proper divisors (85479).

105202021 is an equidigital number, since it uses as much as digits as its factorization.

105202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85478.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 105202021 is about 10256.8036444109. The cubic root of 105202021 is about 472.0717671324.

Adding to 105202021 its reverse (120202501), we get a palindrome (225404522).

The spelling of 105202021 in words is "one hundred five million, two hundred two thousand, twenty-one".