21020023311233 has 4 divisors (see below), whose sum is σ = 21020975370240. Its totient is φ = 21019071252228.

The previous prime is 21020023311229. The next prime is 21020023311241. The reversal of 21020023311233 is 33211332002012.

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 21020023311233 - 2² = 21020023311229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020023311199 and 21020023311208.

It is not an unprimeable number, because it can be changed into a prime (21020023311293) 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, 475996385 + ... + 476040542.

It is an arithmetic number, because the mean of its divisors is an integer number (5255243842560).

Almost surely, 2^{21020023311233} is an apocalyptic number.

It is an amenable number.

21020023311233 is a deficient number, since it is larger than the sum of its proper divisors (952059007).

21020023311233 is an equidigital number, since it uses as much as digits as its factorization.

21020023311233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952059006.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21020023311233 its reverse (33211332002012), we get a palindrome (54231355313245).

The spelling of 21020023311233 in words is "twenty-one trillion, twenty billion, twenty-three million, three hundred eleven thousand, two hundred thirty-three".