87315211632221 has 4 divisors (see below), whose sum is σ = 91111525181472. Its totient is φ = 83518898082972.

The previous prime is 87315211632217. The next prime is 87315211632227. The reversal of 87315211632221 is 12223611251378.

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 87315211632221 - 2² = 87315211632217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87315211632227) 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, 1898156774591 + ... + 1898156774636.

It is an arithmetic number, because the mean of its divisors is an integer number (22777881295368).

Almost surely, 2^{87315211632221} is an apocalyptic number.

It is an amenable number.

87315211632221 is a deficient number, since it is larger than the sum of its proper divisors (3796313549251).

87315211632221 is a wasteful number, since it uses less digits than its factorization.

87315211632221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3796313549250.

The product of its digits is 241920, while the sum is 44.

Adding to 87315211632221 its reverse (12223611251378), we get a palindrome (99538822883599).

The spelling of 87315211632221 in words is "eighty-seven trillion, three hundred fifteen billion, two hundred eleven million, six hundred thirty-two thousand, two hundred twenty-one".