21331222307 has 2 divisors, whose sum is σ = 21331222308. Its totient is φ = 21331222306.

The previous prime is 21331222303. The next prime is 21331222313. The reversal of 21331222307 is 70322213312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21331222307 - 2² = 21331222303 is a prime.

It is a super-2 number, since 2×21331222307² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21331222303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665611153 + 10665611154.

It is an arithmetic number, because the mean of its divisors is an integer number (10665611154).

Almost surely, 2^21331222307 is an apocalyptic number.

21331222307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331222307 is an equidigital number, since it uses as much as digits as its factorization.

21331222307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

Adding to 21331222307 its reverse (70322213312), we get a palindrome (91653435619).

The spelling of 21331222307 in words is "twenty-one billion, three hundred thirty-one million, two hundred twenty-two thousand, three hundred seven".