21373317841 has 2 divisors, whose sum is σ = 21373317842. Its totient is φ = 21373317840.

The previous prime is 21373317839. The next prime is 21373317853. The reversal of 21373317841 is 14871337312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19570890816 + 1802427025 = 139896^2 + 42455^2 .

It is a cyclic number.

It is not a de Polignac number, because 21373317841 - 2¹ = 21373317839 is a prime.

Together with 21373317839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21373317794 and 21373317803.

It is not a weakly prime, because it can be changed into another prime (21373317941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686658920 + 10686658921.

It is an arithmetic number, because the mean of its divisors is an integer number (10686658921).

Almost surely, 2^21373317841 is an apocalyptic number.

It is an amenable number.

21373317841 is a deficient number, since it is larger than the sum of its proper divisors (1).

21373317841 is an equidigital number, since it uses as much as digits as its factorization.

21373317841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The spelling of 21373317841 in words is "twenty-one billion, three hundred seventy-three million, three hundred seventeen thousand, eight hundred forty-one".