16383388421 has 2 divisors, whose sum is σ = 16383388422. Its totient is φ = 16383388420.

The previous prime is 16383388409. The next prime is 16383388429. The reversal of 16383388421 is 12488338361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13649248900 + 2734139521 = 116830^2 + 52289^2 .

It is a cyclic number.

It is not a de Polignac number, because 16383388421 - 2¹⁴ = 16383372037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16383388429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8191694210 + 8191694211.

It is an arithmetic number, because the mean of its divisors is an integer number (8191694211).

Almost surely, 2^16383388421 is an apocalyptic number.

It is an amenable number.

16383388421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16383388421 is an equidigital number, since it uses as much as digits as its factorization.

16383388421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 47.

The spelling of 16383388421 in words is "sixteen billion, three hundred eighty-three million, three hundred eighty-eight thousand, four hundred twenty-one".