13822765421 has 2 divisors, whose sum is σ = 13822765422. Its totient is φ = 13822765420.

The previous prime is 13822765417. The next prime is 13822765447. The reversal of 13822765421 is 12456722831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13221780196 + 600985225 = 114986^2 + 24515^2 .

It is a cyclic number.

It is not a de Polignac number, because 13822765421 - 2² = 13822765417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13822765321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6911382710 + 6911382711.

It is an arithmetic number, because the mean of its divisors is an integer number (6911382711).

Almost surely, 2^13822765421 is an apocalyptic number.

It is an amenable number.

13822765421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13822765421 is an equidigital number, since it uses as much as digits as its factorization.

13822765421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 41.

The spelling of 13822765421 in words is "thirteen billion, eight hundred twenty-two million, seven hundred sixty-five thousand, four hundred twenty-one".