21324219859897 has 2 divisors, whose sum is σ = 21324219859898. Its totient is φ = 21324219859896.

The previous prime is 21324219859889. The next prime is 21324219859909. The reversal of 21324219859897 is 79895891242312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20939446529296 + 384773330601 = 4575964^2 + 620301^2 .

It is a cyclic number.

It is not a de Polignac number, because 21324219859897 - 2³ = 21324219859889 is a prime.

It is not a weakly prime, because it can be changed into another prime (21324219859867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662109929948 + 10662109929949.

It is an arithmetic number, because the mean of its divisors is an integer number (10662109929949).

Almost surely, 2^{21324219859897} is an apocalyptic number.

It is an amenable number.

21324219859897 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324219859897 is an equidigital number, since it uses as much as digits as its factorization.

21324219859897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156764160, while the sum is 70.

The spelling of 21324219859897 in words is "twenty-one trillion, three hundred twenty-four billion, two hundred nineteen million, eight hundred fifty-nine thousand, eight hundred ninety-seven".