1103321312021 has 4 divisors (see below), whose sum is σ = 1151291803872. Its totient is φ = 1055350820172.

The previous prime is 1103321311993. The next prime is 1103321312029. The reversal of 1103321312021 is 1202131233011.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1103321312021 - 2³⁸ = 828443405077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1103321311984 and 1103321312002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1103321312029) 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, 23985245891 + ... + 23985245936.

It is an arithmetic number, because the mean of its divisors is an integer number (287822950968).

Almost surely, 2^{1103321312021} is an apocalyptic number.

It is an amenable number.

1103321312021 is a deficient number, since it is larger than the sum of its proper divisors (47970491851).

1103321312021 is an equidigital number, since it uses as much as digits as its factorization.

1103321312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47970491850.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1103321312021 its reverse (1202131233011), we get a palindrome (2305452545032).

The spelling of 1103321312021 in words is "one trillion, one hundred three billion, three hundred twenty-one million, three hundred twelve thousand, twenty-one".