21100971007 has 2 divisors, whose sum is σ = 21100971008. Its totient is φ = 21100971006.

The previous prime is 21100970941. The next prime is 21100971011. The reversal of 21100971007 is 70017900112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100971007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100972007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550485503 + 10550485504.

It is an arithmetic number, because the mean of its divisors is an integer number (10550485504).

Almost surely, 2^21100971007 is an apocalyptic number.

21100971007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100971007 is an equidigital number, since it uses as much as digits as its factorization.

21100971007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 28.

The spelling of 21100971007 in words is "twenty-one billion, one hundred million, nine hundred seventy-one thousand, seven".