87388682451221 has 4 divisors (see below), whose sum is σ = 90207672207744. Its totient is φ = 84569692694700.

The previous prime is 87388682451173. The next prime is 87388682451269. The reversal of 87388682451221 is 12215428688378.

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 an interprime number because it is at equal distance from previous prime (87388682451173) and next prime (87388682451269).

It is a cyclic number.

It is not a de Polignac number, because 87388682451221 - 2⁴² = 82990635940117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87388682453221) 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 3 ways as a sum of consecutive naturals, for example, 1409494878215 + ... + 1409494878276.

It is an arithmetic number, because the mean of its divisors is an integer number (22551918051936).

Almost surely, 2^{87388682451221} is an apocalyptic number.

It is an amenable number.

87388682451221 is a deficient number, since it is larger than the sum of its proper divisors (2818989756523).

87388682451221 is a wasteful number, since it uses less digits than its factorization.

87388682451221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818989756522.

The product of its digits is 82575360, while the sum is 65.

The spelling of 87388682451221 in words is "eighty-seven trillion, three hundred eighty-eight billion, six hundred eighty-two million, four hundred fifty-one thousand, two hundred twenty-one".