21020320023233 has 4 divisors (see below), whose sum is σ = 21100245194688. Its totient is φ = 20940394851780.

The previous prime is 21020320023203. The next prime is 21020320023293. The reversal of 21020320023233 is 33232002302012.

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 21020320023233 - 2⁶ = 21020320023169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21020320023199 and 21020320023208.

It is not an unprimeable number, because it can be changed into a prime (21020320023203) 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, 39962585333 + ... + 39962585858.

It is an arithmetic number, because the mean of its divisors is an integer number (5275061298672).

Almost surely, 2^{21020320023233} is an apocalyptic number.

It is an amenable number.

21020320023233 is a deficient number, since it is larger than the sum of its proper divisors (79925171455).

21020320023233 is an equidigital number, since it uses as much as digits as its factorization.

21020320023233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79925171454.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21020320023233 its reverse (33232002302012), we get a palindrome (54252322325245).

The spelling of 21020320023233 in words is "twenty-one trillion, twenty billion, three hundred twenty million, twenty-three thousand, two hundred thirty-three".