993340421 has 2 divisors, whose sum is σ = 993340422. Its totient is φ = 993340420.

The previous prime is 993340373. The next prime is 993340433. The reversal of 993340421 is 124043399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 963419521 + 29920900 = 31039^2 + 5470^2 .

It is an emirp because it is prime and its reverse (124043399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 993340421 - 2¹⁸ = 993078277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993340021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496670210 + 496670211.

It is an arithmetic number, because the mean of its divisors is an integer number (496670211).

Almost surely, 2^993340421 is an apocalyptic number.

It is an amenable number.

993340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

993340421 is an equidigital number, since it uses as much as digits as its factorization.

993340421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 993340421 is about 31517.3035172744. The cubic root of 993340421 is about 997.7751942434.

The spelling of 993340421 in words is "nine hundred ninety-three million, three hundred forty thousand, four hundred twenty-one".