21103033321 has 4 divisors (see below), whose sum is σ = 21109695700. Its totient is φ = 21096370944.

The previous prime is 21103033313. The next prime is 21103033337. The reversal of 21103033321 is 12333030112.

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 19955517696 + 1147515625 = 141264^2 + 33875^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103033321 - 2³ = 21103033313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103037321) 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, 3326436 + ... + 3332773.

It is an arithmetic number, because the mean of its divisors is an integer number (5277423925).

Almost surely, 2^21103033321 is an apocalyptic number.

It is an amenable number.

21103033321 is a deficient number, since it is larger than the sum of its proper divisors (6662379).

21103033321 is an equidigital number, since it uses as much as digits as its factorization.

21103033321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662378.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21103033321 its reverse (12333030112), we get a palindrome (33436063433).

The spelling of 21103033321 in words is "twenty-one billion, one hundred three million, thirty-three thousand, three hundred twenty-one".