21703511101 has 2 divisors, whose sum is σ = 21703511102. Its totient is φ = 21703511100.

The previous prime is 21703511051. The next prime is 21703511191. The reversal of 21703511101 is 10111530712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12132802201 + 9570708900 = 110149^2 + 97830^2 .

It is a cyclic number.

It is not a de Polignac number, because 21703511101 - 2¹¹ = 21703509053 is a prime.

It is a super-2 number, since 2×21703511101² (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 (21703511191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10851755550 + 10851755551.

It is an arithmetic number, because the mean of its divisors is an integer number (10851755551).

Almost surely, 2^21703511101 is an apocalyptic number.

It is an amenable number.

21703511101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21703511101 is an equidigital number, since it uses as much as digits as its factorization.

21703511101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 22.

The spelling of 21703511101 in words is "twenty-one billion, seven hundred three million, five hundred eleven thousand, one hundred one".