16722033421 has 2 divisors, whose sum is σ = 16722033422. Its totient is φ = 16722033420.

The previous prime is 16722033407. The next prime is 16722033439. The reversal of 16722033421 is 12433022761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12440948521 + 4281084900 = 111539^2 + 65430^2 .

It is a cyclic number.

It is not a de Polignac number, because 16722033421 - 2⁹ = 16722032909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16722033491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361016710 + 8361016711.

It is an arithmetic number, because the mean of its divisors is an integer number (8361016711).

Almost surely, 2^16722033421 is an apocalyptic number.

It is an amenable number.

16722033421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16722033421 is an equidigital number, since it uses as much as digits as its factorization.

16722033421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 31.

The spelling of 16722033421 in words is "sixteen billion, seven hundred twenty-two million, thirty-three thousand, four hundred twenty-one".