873641021 has 4 divisors (see below), whose sum is σ = 953062944. Its totient is φ = 794219100.

The previous prime is 873641017. The next prime is 873641023. The reversal of 873641021 is 120146378.

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 not a de Polignac number, because 873641021 - 2² = 873641017 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 (873641023) 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, 39710945 + ... + 39710966.

It is an arithmetic number, because the mean of its divisors is an integer number (238265736).

Almost surely, 2^873641021 is an apocalyptic number.

It is an amenable number.

873641021 is a deficient number, since it is larger than the sum of its proper divisors (79421923).

873641021 is a wasteful number, since it uses less digits than its factorization.

873641021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79421922.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 873641021 is about 29557.4190517372. The cubic root of 873641021 is about 955.9701665643.

Adding to 873641021 its reverse (120146378), we get a palindrome (993787399).

The spelling of 873641021 in words is "eight hundred seventy-three million, six hundred forty-one thousand, twenty-one".