1021105445 has 4 divisors (see below), whose sum is σ = 1225326540. Its totient is φ = 816884352.

The previous prime is 1021105433. The next prime is 1021105469. The reversal of 1021105445 is 5445011201.

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 756360004 + 264745441 = 27502^2 + 16271^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021105445 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021105445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102110540 + ... + 102110549.

It is an arithmetic number, because the mean of its divisors is an integer number (306331635).

Almost surely, 2^1021105445 is an apocalyptic number.

It is an amenable number.

1021105445 is a deficient number, since it is larger than the sum of its proper divisors (204221095).

1021105445 is an equidigital number, since it uses as much as digits as its factorization.

1021105445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204221094.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1021105445 is about 31954.7405716272. The cubic root of 1021105445 is about 1006.9862273016.

Adding to 1021105445 its reverse (5445011201), we get a palindrome (6466116646).

The spelling of 1021105445 in words is "one billion, twenty-one million, one hundred five thousand, four hundred forty-five".