21100970941 has 2 divisors, whose sum is σ = 21100970942. Its totient is φ = 21100970940.

The previous prime is 21100970921. The next prime is 21100971007. The reversal of 21100970941 is 14907900112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13417747225 + 7683223716 = 115835^2 + 87654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100970941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100970897 and 21100970906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100970921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550485470 + 10550485471.

It is an arithmetic number, because the mean of its divisors is an integer number (10550485471).

Almost surely, 2^21100970941 is an apocalyptic number.

It is an amenable number.

21100970941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100970941 is an equidigital number, since it uses as much as digits as its factorization.

21100970941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 21100970941 in words is "twenty-one billion, one hundred million, nine hundred seventy thousand, nine hundred forty-one".