21100575701 has 2 divisors, whose sum is σ = 21100575702. Its totient is φ = 21100575700.

The previous prime is 21100575689. The next prime is 21100575731. The reversal of 21100575701 is 10757500112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13473173476 + 7627402225 = 116074^2 + 87335^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100575701 - 2¹⁸ = 21100313557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100575731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550287850 + 10550287851.

It is an arithmetic number, because the mean of its divisors is an integer number (10550287851).

Almost surely, 2^21100575701 is an apocalyptic number.

It is an amenable number.

21100575701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100575701 is an equidigital number, since it uses as much as digits as its factorization.

21100575701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2450, while the sum is 29.

The spelling of 21100575701 in words is "twenty-one billion, one hundred million, five hundred seventy-five thousand, seven hundred one".