16764733421 has 2 divisors, whose sum is σ = 16764733422. Its totient is φ = 16764733420.

The previous prime is 16764733339. The next prime is 16764733457. The reversal of 16764733421 is 12433746761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16696257796 + 68475625 = 129214^2 + 8275^2 .

It is an emirp because it is prime and its reverse (12433746761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16764733421 - 2¹⁸ = 16764471277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16764733621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8382366710 + 8382366711.

It is an arithmetic number, because the mean of its divisors is an integer number (8382366711).

Almost surely, 2^16764733421 is an apocalyptic number.

It is an amenable number.

16764733421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16764733421 is an equidigital number, since it uses as much as digits as its factorization.

16764733421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 44.

The spelling of 16764733421 in words is "sixteen billion, seven hundred sixty-four million, seven hundred thirty-three thousand, four hundred twenty-one".