21101102207 has 2 divisors, whose sum is σ = 21101102208. Its totient is φ = 21101102206.

The previous prime is 21101102203. The next prime is 21101102237. The reversal of 21101102207 is 70220110112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101102207 - 2² = 21101102203 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101102203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550551103 + 10550551104.

It is an arithmetic number, because the mean of its divisors is an integer number (10550551104).

Almost surely, 2^21101102207 is an apocalyptic number.

21101102207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101102207 is an equidigital number, since it uses as much as digits as its factorization.

21101102207 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 17.

Adding to 21101102207 its reverse (70220110112), we get a palindrome (91321212319).

The spelling of 21101102207 in words is "twenty-one billion, one hundred one million, one hundred two thousand, two hundred seven".