993212921 has 2 divisors, whose sum is σ = 993212922. Its totient is φ = 993212920.

The previous prime is 993212911. The next prime is 993212989. The reversal of 993212921 is 129212399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944701696 + 48511225 = 30736^2 + 6965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-993212921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (993212911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496606460 + 496606461.

It is an arithmetic number, because the mean of its divisors is an integer number (496606461).

Almost surely, 2^993212921 is an apocalyptic number.

It is an amenable number.

993212921 is a deficient number, since it is larger than the sum of its proper divisors (1).

993212921 is an equidigital number, since it uses as much as digits as its factorization.

993212921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 38.

The square root of 993212921 is about 31515.2807539454. The cubic root of 993212921 is about 997.7325026754.

The spelling of 993212921 in words is "nine hundred ninety-three million, two hundred twelve thousand, nine hundred twenty-one".