21213313207 has 2 divisors, whose sum is σ = 21213313208. Its totient is φ = 21213313206.

The previous prime is 21213313171. The next prime is 21213313217. The reversal of 21213313207 is 70231331212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213313207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213313217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606656603 + 10606656604.

It is an arithmetic number, because the mean of its divisors is an integer number (10606656604).

Almost surely, 2^21213313207 is an apocalyptic number.

21213313207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213313207 is an equidigital number, since it uses as much as digits as its factorization.

21213313207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21213313207 its reverse (70231331212), we get a palindrome (91444644419).

The spelling of 21213313207 in words is "twenty-one billion, two hundred thirteen million, three hundred thirteen thousand, two hundred seven".