21344274463073 has 2 divisors, whose sum is σ = 21344274463074. Its totient is φ = 21344274463072.

The previous prime is 21344274463069. The next prime is 21344274463123. The reversal of 21344274463073 is 37036447244312.

It is an a-pointer prime, because the next prime (21344274463123) can be obtained adding 21344274463073 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21295206896929 + 49067566144 = 4614673^2 + 221512^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344274463073 - 2² = 21344274463069 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344274463873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672137231536 + 10672137231537.

It is an arithmetic number, because the mean of its divisors is an integer number (10672137231537).

Almost surely, 2^{21344274463073} is an apocalyptic number.

It is an amenable number.

21344274463073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344274463073 is an equidigital number, since it uses as much as digits as its factorization.

21344274463073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 50.

The spelling of 21344274463073 in words is "twenty-one trillion, three hundred forty-four billion, two hundred seventy-four million, four hundred sixty-three thousand, seventy-three".