9393121021 has 4 divisors (see below), whose sum is σ = 9393620544. Its totient is φ = 9392621500.

The previous prime is 9393120977. The next prime is 9393121081. The reversal of 9393121021 is 1201213939.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1201213939 = 23 ⋅52226693.

It is a cyclic number.

It is not a de Polignac number, because 9393121021 - 2¹⁵ = 9393088253 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 (9393121081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220405 + ... + 259546.

It is an arithmetic number, because the mean of its divisors is an integer number (2348405136).

Almost surely, 2^9393121021 is an apocalyptic number.

It is an amenable number.

9393121021 is a deficient number, since it is larger than the sum of its proper divisors (499523).

9393121021 is a wasteful number, since it uses less digits than its factorization.

9393121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499522.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 9393121021 is about 96918.1150301635. The cubic root of 9393121021 is about 2109.9393542912.

The spelling of 9393121021 in words is "nine billion, three hundred ninety-three million, one hundred twenty-one thousand, twenty-one".