215887121 has 8 divisors (see below), whose sum is σ = 220700160. Its totient is φ = 211083328.

The previous prime is 215887103. The next prime is 215887123. The reversal of 215887121 is 121788512.

215887121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215887121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215887123) 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, 68345 + ... + 71433.

It is an arithmetic number, because the mean of its divisors is an integer number (27587520).

Almost surely, 2^215887121 is an apocalyptic number.

It is an amenable number.

215887121 is a deficient number, since it is larger than the sum of its proper divisors (4813039).

215887121 is a wasteful number, since it uses less digits than its factorization.

215887121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623.

The product of its digits is 8960, while the sum is 35.

The square root of 215887121 is about 14693.0977332896. The cubic root of 215887121 is about 599.8954641956.

The spelling of 215887121 in words is "two hundred fifteen million, eight hundred eighty-seven thousand, one hundred twenty-one".