993420121 has 2 divisors, whose sum is σ = 993420122. Its totient is φ = 993420120.

The previous prime is 993420097. The next prime is 993420137. The reversal of 993420121 is 121024399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 729000000 + 264420121 = 27000^2 + 16261^2 .

It is a cyclic number.

It is not a de Polignac number, because 993420121 - 2¹⁹ = 992895833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (993420161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496710060 + 496710061.

It is an arithmetic number, because the mean of its divisors is an integer number (496710061).

Almost surely, 2^993420121 is an apocalyptic number.

It is an amenable number.

993420121 is a deficient number, since it is larger than the sum of its proper divisors (1).

993420121 is an equidigital number, since it uses as much as digits as its factorization.

993420121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 993420121 is about 31518.5678767294. The cubic root of 993420121 is about 997.8018788035.

The spelling of 993420121 in words is "nine hundred ninety-three million, four hundred twenty thousand, one hundred twenty-one".