21220012207 has 2 divisors, whose sum is σ = 21220012208. Its totient is φ = 21220012206.

The previous prime is 21220012201. The next prime is 21220012223. The reversal of 21220012207 is 70221002212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220012207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220012201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610006103 + 10610006104.

It is an arithmetic number, because the mean of its divisors is an integer number (10610006104).

Almost surely, 2^21220012207 is an apocalyptic number.

21220012207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220012207 is an equidigital number, since it uses as much as digits as its factorization.

21220012207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

Adding to 21220012207 its reverse (70221002212), we get a palindrome (91441014419).

The spelling of 21220012207 in words is "twenty-one billion, two hundred twenty million, twelve thousand, two hundred seven".