21211120207 has 2 divisors, whose sum is σ = 21211120208. Its totient is φ = 21211120206.

The previous prime is 21211120199. The next prime is 21211120253. The reversal of 21211120207 is 70202111212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211120207 - 2³ = 21211120199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211120807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605560103 + 10605560104.

It is an arithmetic number, because the mean of its divisors is an integer number (10605560104).

Almost surely, 2^21211120207 is an apocalyptic number.

21211120207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211120207 is an equidigital number, since it uses as much as digits as its factorization.

21211120207 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 19.

Adding to 21211120207 its reverse (70202111212), we get a palindrome (91413231419).

The spelling of 21211120207 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, two hundred seven".