93442821 has 4 divisors (see below), whose sum is σ = 124590432. Its totient is φ = 62295212.

The previous prime is 93442819. The next prime is 93442831. The reversal of 93442821 is 12824439.

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: 12824439 = 3 ⋅4274813.

It is a cyclic number.

It is not a de Polignac number, because 93442821 - 2¹ = 93442819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93442831) 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, 15573801 + ... + 15573806.

It is an arithmetic number, because the mean of its divisors is an integer number (31147608).

Almost surely, 2^93442821 is an apocalyptic number.

It is an amenable number.

93442821 is a deficient number, since it is larger than the sum of its proper divisors (31147611).

93442821 is a wasteful number, since it uses less digits than its factorization.

93442821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31147610.

The product of its digits is 13824, while the sum is 33.

The square root of 93442821 is about 9666.5826950376. The cubic root of 93442821 is about 453.7834441726.

The spelling of 93442821 in words is "ninety-three million, four hundred forty-two thousand, eight hundred twenty-one".