21100030207 has 2 divisors, whose sum is σ = 21100030208. Its totient is φ = 21100030206.

The previous prime is 21100030201. The next prime is 21100030243. The reversal of 21100030207 is 70203000112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100030207 is a prime.

It is a super-2 number, since 2×21100030207² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100030201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550015103 + 10550015104.

It is an arithmetic number, because the mean of its divisors is an integer number (10550015104).

Almost surely, 2^21100030207 is an apocalyptic number.

21100030207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100030207 is an equidigital number, since it uses as much as digits as its factorization.

21100030207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

Adding to 21100030207 its reverse (70203000112), we get a palindrome (91303030319).

The spelling of 21100030207 in words is "twenty-one billion, one hundred million, thirty thousand, two hundred seven".