94040857821 has 4 divisors (see below), whose sum is σ = 125387810432. Its totient is φ = 62693905212.

The previous prime is 94040857769. The next prime is 94040857837. The reversal of 94040857821 is 12875804049.

It is a happy number.

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 not a de Polignac number, because 94040857821 - 2⁷ = 94040857693 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 (94040857861) 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, 15673476301 + ... + 15673476306.

It is an arithmetic number, because the mean of its divisors is an integer number (31346952608).

Almost surely, 2^94040857821 is an apocalyptic number.

It is an amenable number.

94040857821 is a deficient number, since it is larger than the sum of its proper divisors (31346952611).

94040857821 is a wasteful number, since it uses less digits than its factorization.

94040857821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31346952610.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 94040857821 in words is "ninety-four billion, forty million, eight hundred fifty-seven thousand, eight hundred twenty-one".