21000222007 has 2 divisors, whose sum is σ = 21000222008. Its totient is φ = 21000222006.

The previous prime is 21000221989. The next prime is 21000222071. The reversal of 21000222007 is 70022200012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000222007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000222707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500111003 + 10500111004.

It is an arithmetic number, because the mean of its divisors is an integer number (10500111004).

Almost surely, 2^21000222007 is an apocalyptic number.

21000222007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000222007 is an equidigital number, since it uses as much as digits as its factorization.

21000222007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 16.

Adding to 21000222007 its reverse (70022200012), we get a palindrome (91022422019).

The spelling of 21000222007 in words is "twenty-one billion, two hundred twenty-two thousand, seven".