87644224121 has 4 divisors (see below), whose sum is σ = 87736191732. Its totient is φ = 87552256512.

The previous prime is 87644224117. The next prime is 87644224177. The reversal of 87644224121 is 12142244678.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49757548096 + 37886676025 = 223064^2 + 194645^2 .

It is a cyclic number.

It is not a de Polignac number, because 87644224121 - 2² = 87644224117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87644224181) 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, 45982376 + ... + 45984281.

It is an arithmetic number, because the mean of its divisors is an integer number (21934047933).

Almost surely, 2^87644224121 is an apocalyptic number.

It is an amenable number.

87644224121 is a deficient number, since it is larger than the sum of its proper divisors (91967611).

87644224121 is an equidigital number, since it uses as much as digits as its factorization.

87644224121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91967610.

The product of its digits is 172032, while the sum is 41.

Adding to 87644224121 its reverse (12142244678), we get a palindrome (99786468799).

The spelling of 87644224121 in words is "eighty-seven billion, six hundred forty-four million, two hundred twenty-four thousand, one hundred twenty-one".