21313220207 has 2 divisors, whose sum is σ = 21313220208. Its totient is φ = 21313220206.

The previous prime is 21313220177. The next prime is 21313220221. The reversal of 21313220207 is 70202231312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21313220207 is a prime.

It is a super-4 number, since 4×21313220207⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313220107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656610103 + 10656610104.

It is an arithmetic number, because the mean of its divisors is an integer number (10656610104).

Almost surely, 2^21313220207 is an apocalyptic number.

21313220207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313220207 is an equidigital number, since it uses as much as digits as its factorization.

21313220207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

Adding to 21313220207 its reverse (70202231312), we get a palindrome (91515451519).

The spelling of 21313220207 in words is "twenty-one billion, three hundred thirteen million, two hundred twenty thousand, two hundred seven".