21000002102207 has 2 divisors, whose sum is σ = 21000002102208. Its totient is φ = 21000002102206.

The previous prime is 21000002102099. The next prime is 21000002102231. The reversal of 21000002102207 is 70220120000012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000002102207 - 2⁴² = 16601955591103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000002102407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500001051103 + 10500001051104.

It is an arithmetic number, because the mean of its divisors is an integer number (10500001051104).

Almost surely, 2^{21000002102207} is an apocalyptic number.

21000002102207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000002102207 is an equidigital number, since it uses as much as digits as its factorization.

21000002102207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

Adding to 21000002102207 its reverse (70220120000012), we get a palindrome (91220122102219).

The spelling of 21000002102207 in words is "twenty-one trillion, two million, one hundred two thousand, two hundred seven".