6733400021 has 2 divisors, whose sum is σ = 6733400022. Its totient is φ = 6733400020.

The previous prime is 6733399997. The next prime is 6733400059. The reversal of 6733400021 is 1200043376.

6733400021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6733023025 + 376996 = 82055^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 6733400021 - 2¹⁴ = 6733383637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6733400081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3366700010 + 3366700011.

It is an arithmetic number, because the mean of its divisors is an integer number (3366700011).

Almost surely, 2^6733400021 is an apocalyptic number.

It is an amenable number.

6733400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6733400021 is an equidigital number, since it uses as much as digits as its factorization.

6733400021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 6733400021 is about 82057.2971831269. The cubic root of 6733400021 is about 1888.3310688223.

Adding to 6733400021 its reverse (1200043376), we get a palindrome (7933443397).

The spelling of 6733400021 in words is "six billion, seven hundred thirty-three million, four hundred thousand, twenty-one".