21033303023221 has 4 divisors (see below), whose sum is σ = 22270556142252. Its totient is φ = 19796049904192.

The previous prime is 21033303023203. The next prime is 21033303023269. The reversal of 21033303023221 is 12232030333012.

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 15024259740996 + 6009043282225 = 3876114^2 + 2451335^2 .

It is not a de Polignac number, because 21033303023221 - 2⁵ = 21033303023189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033303021221) 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, 618626559490 + ... + 618626559523.

It is an arithmetic number, because the mean of its divisors is an integer number (5567639035563).

Almost surely, 2^{21033303023221} is an apocalyptic number.

It is an amenable number.

21033303023221 is a deficient number, since it is larger than the sum of its proper divisors (1237253119031).

21033303023221 is a wasteful number, since it uses less digits than its factorization.

21033303023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237253119030.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 21033303023221 its reverse (12232030333012), we get a palindrome (33265333356233).

The spelling of 21033303023221 in words is "twenty-one trillion, thirty-three billion, three hundred three million, twenty-three thousand, two hundred twenty-one".