87722537221721 has 8 divisors (see below), whose sum is σ = 87898759080000. Its totient is φ = 87546317065200.

The previous prime is 87722537221699. The next prime is 87722537221771. The reversal of 87722537221721 is 12712273522778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87722537221721 - 2¹⁰ = 87722537220697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87722537221771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176673035 + ... + 177168863.

It is an arithmetic number, because the mean of its divisors is an integer number (10987344885000).

Almost surely, 2^{87722537221721} is an apocalyptic number.

It is an amenable number.

87722537221721 is a deficient number, since it is larger than the sum of its proper divisors (176221858279).

87722537221721 is a wasteful number, since it uses less digits than its factorization.

87722537221721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850879.

The product of its digits is 9219840, while the sum is 56.

The spelling of 87722537221721 in words is "eighty-seven trillion, seven hundred twenty-two billion, five hundred thirty-seven million, two hundred twenty-one thousand, seven hundred twenty-one".