21210010207 has 2 divisors, whose sum is σ = 21210010208. Its totient is φ = 21210010206.

The previous prime is 21210010189. The next prime is 21210010223. The reversal of 21210010207 is 70201001212.

It is an a-pointer prime, because the next prime (21210010223) can be obtained adding 21210010207 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210010207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210010247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605005103 + 10605005104.

It is an arithmetic number, because the mean of its divisors is an integer number (10605005104).

Almost surely, 2^21210010207 is an apocalyptic number.

21210010207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210010207 is an equidigital number, since it uses as much as digits as its factorization.

21210010207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 21210010207 its reverse (70201001212), we get a palindrome (91411011419).

The spelling of 21210010207 in words is "twenty-one billion, two hundred ten million, ten thousand, two hundred seven".