21230203331 has 2 divisors, whose sum is σ = 21230203332. Its totient is φ = 21230203330.

The previous prime is 21230203301. The next prime is 21230203367. The reversal of 21230203331 is 13330203212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230203331 - 2²² = 21226009027 is a prime.

It is a super-2 number, since 2×21230203331² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21230203301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615101665 + 10615101666.

It is an arithmetic number, because the mean of its divisors is an integer number (10615101666).

Almost surely, 2^21230203331 is an apocalyptic number.

21230203331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230203331 is an equidigital number, since it uses as much as digits as its factorization.

21230203331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21230203331 its reverse (13330203212), we get a palindrome (34560406543).

The spelling of 21230203331 in words is "twenty-one billion, two hundred thirty million, two hundred three thousand, three hundred thirty-one".