93943157821 has 4 divisors (see below), whose sum is σ = 94080703392. Its totient is φ = 93805612252.

The previous prime is 93943157747. The next prime is 93943157839. The reversal of 93943157821 is 12875134939.

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: 12875134939 = 19 ⋅677638681.

It is a cyclic number.

It is not a de Polignac number, because 93943157821 - 2¹¹ = 93943155773 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 (93943151821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68771761 + ... + 68773126.

It is an arithmetic number, because the mean of its divisors is an integer number (23520175848).

Almost surely, 2^93943157821 is an apocalyptic number.

It is an amenable number.

93943157821 is a deficient number, since it is larger than the sum of its proper divisors (137545571).

93943157821 is a wasteful number, since it uses less digits than its factorization.

93943157821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137545570.

The product of its digits is 1632960, while the sum is 52.

The spelling of 93943157821 in words is "ninety-three billion, nine hundred forty-three million, one hundred fifty-seven thousand, eight hundred twenty-one".