993760021 has 4 divisors (see below), whose sum is σ = 1046063200. Its totient is φ = 941456844.

The previous prime is 993759989. The next prime is 993760037. The reversal of 993760021 is 120067399.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 993760021 - 2⁵ = 993759989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993760421) 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 in 3 ways as a sum of consecutive naturals, for example, 26151561 + ... + 26151598.

It is an arithmetic number, because the mean of its divisors is an integer number (261515800).

Almost surely, 2^993760021 is an apocalyptic number.

It is an amenable number.

993760021 is a deficient number, since it is larger than the sum of its proper divisors (52303179).

993760021 is a wasteful number, since it uses less digits than its factorization.

993760021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52303178.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 993760021 is about 31523.9594752943. The cubic root of 993760021 is about 997.9156655684.

The spelling of 993760021 in words is "nine hundred ninety-three million, seven hundred sixty thousand, twenty-one".