21223231207 has 2 divisors, whose sum is σ = 21223231208. Its totient is φ = 21223231206.

The previous prime is 21223231199. The next prime is 21223231229. The reversal of 21223231207 is 70213232212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223231207 - 2³ = 21223231199 is a prime.

It is a super-3 number, since 3×21223231207³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223231277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611615603 + 10611615604.

It is an arithmetic number, because the mean of its divisors is an integer number (10611615604).

Almost surely, 2^21223231207 is an apocalyptic number.

21223231207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223231207 is an equidigital number, since it uses as much as digits as its factorization.

21223231207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21223231207 its reverse (70213232212), we get a palindrome (91436463419).

The spelling of 21223231207 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred seven".