21099180701 has 2 divisors, whose sum is σ = 21099180702. Its totient is φ = 21099180700.

The previous prime is 21099180691. The next prime is 21099180721. The reversal of 21099180701 is 10708199012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17669321476 + 3429859225 = 132926^2 + 58565^2 .

It is a cyclic number.

It is not a de Polignac number, because 21099180701 - 2¹⁰ = 21099179677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21099180721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10549590350 + 10549590351.

It is an arithmetic number, because the mean of its divisors is an integer number (10549590351).

Almost surely, 2^21099180701 is an apocalyptic number.

It is an amenable number.

21099180701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21099180701 is an equidigital number, since it uses as much as digits as its factorization.

21099180701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 38.

The spelling of 21099180701 in words is "twenty-one billion, ninety-nine million, one hundred eighty thousand, seven hundred one".