93721037921 has 4 divisors (see below), whose sum is σ = 107109757632. Its totient is φ = 80332318212.

The previous prime is 93721037863. The next prime is 93721037947. The reversal of 93721037921 is 12973012739.

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 a de Polignac number, because none of the positive numbers 2^k-93721037921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (93721037981) 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, 6694359845 + ... + 6694359858.

It is an arithmetic number, because the mean of its divisors is an integer number (26777439408).

Almost surely, 2^93721037921 is an apocalyptic number.

It is an amenable number.

93721037921 is a deficient number, since it is larger than the sum of its proper divisors (13388719711).

93721037921 is a wasteful number, since it uses less digits than its factorization.

93721037921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13388719710.

The product of its (nonzero) digits is 142884, while the sum is 44.

The spelling of 93721037921 in words is "ninety-three billion, seven hundred twenty-one million, thirty-seven thousand, nine hundred twenty-one".