1103500021 has 4 divisors (see below), whose sum is σ = 1188384652. Its totient is φ = 1018615392.

The previous prime is 1103499989. The next prime is 1103500093. The reversal of 1103500021 is 1200053011.

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 297735025 + 805764996 = 17255^2 + 28386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1103500021 - 2⁵ = 1103499989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 84884617 = 1103500021 / (1 + 1 + 0 + 3 + 5 + 0 + 0 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1103499974 and 1103500010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1103507021) 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, 42442296 + ... + 42442321.

It is an arithmetic number, because the mean of its divisors is an integer number (297096163).

Almost surely, 2^1103500021 is an apocalyptic number.

It is an amenable number.

1103500021 is a deficient number, since it is larger than the sum of its proper divisors (84884631).

1103500021 is an equidigital number, since it uses as much as digits as its factorization.

1103500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84884630.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1103500021 is about 33218.9707998306. The cubic root of 1103500021 is about 1033.3738054099.

Adding to 1103500021 its reverse (1200053011), we get a palindrome (2303553032).

The spelling of 1103500021 in words is "one billion, one hundred three million, five hundred thousand, twenty-one".