20312221207 has 2 divisors, whose sum is σ = 20312221208. Its totient is φ = 20312221206.

The previous prime is 20312221199. The next prime is 20312221217. The reversal of 20312221207 is 70212221302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20312221207 - 2³ = 20312221199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312221217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156110603 + 10156110604.

It is an arithmetic number, because the mean of its divisors is an integer number (10156110604).

Almost surely, 2^20312221207 is an apocalyptic number.

20312221207 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312221207 is an equidigital number, since it uses as much as digits as its factorization.

20312221207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 20312221207 its reverse (70212221302), we get a palindrome (90524442509).

The spelling of 20312221207 in words is "twenty billion, three hundred twelve million, two hundred twenty-one thousand, two hundred seven".