21680433097 has 2 divisors, whose sum is σ = 21680433098. Its totient is φ = 21680433096.

The previous prime is 21680433083. The next prime is 21680433119. The reversal of 21680433097 is 79033408612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19872822841 + 1807610256 = 140971^2 + 42516^2 .

It is a cyclic number.

It is not a de Polignac number, because 21680433097 - 2²³ = 21672044489 is a prime.

It is a super-2 number, since 2×21680433097² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21680439097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10840216548 + 10840216549.

It is an arithmetic number, because the mean of its divisors is an integer number (10840216549).

Almost surely, 2^21680433097 is an apocalyptic number.

It is an amenable number.

21680433097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21680433097 is an equidigital number, since it uses as much as digits as its factorization.

21680433097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 21680433097 in words is "twenty-one billion, six hundred eighty million, four hundred thirty-three thousand, ninety-seven".