87215421 has 8 divisors (see below), whose sum is σ = 118193824. Its totient is φ = 57190320.

The previous prime is 87215407. The next prime is 87215459. The reversal of 87215421 is 12451278.

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

It is not a de Polignac number, because 87215421 - 2¹⁸ = 86953277 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 (87215021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238111 + ... + 238476.

It is an arithmetic number, because the mean of its divisors is an integer number (14774228).

Almost surely, 2^87215421 is an apocalyptic number.

It is an amenable number.

87215421 is a deficient number, since it is larger than the sum of its proper divisors (30978403).

87215421 is a wasteful number, since it uses less digits than its factorization.

87215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476651.

The product of its digits is 4480, while the sum is 30.

The square root of 87215421 is about 9338.9196912705. The cubic root of 87215421 is about 443.4701851366.

Adding to 87215421 its reverse (12451278), we get a palindrome (99666699).

The spelling of 87215421 in words is "eighty-seven million, two hundred fifteen thousand, four hundred twenty-one".