215545121 has 8 divisors (see below), whose sum is σ = 245363904. Its totient is φ = 187430320.

The previous prime is 215545103. The next prime is 215545133. The reversal of 215545121 is 121545512.

215545121 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 not a de Polignac number, because 215545121 - 2¹⁰ = 215544097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215545181) 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, 425726 + ... + 426231.

It is an arithmetic number, because the mean of its divisors is an integer number (30670488).

Almost surely, 2^215545121 is an apocalyptic number.

It is an amenable number.

215545121 is a deficient number, since it is larger than the sum of its proper divisors (29818783).

215545121 is a wasteful number, since it uses less digits than its factorization.

215545121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851991.

The product of its digits is 2000, while the sum is 26.

The square root of 215545121 is about 14681.4550028258. The cubic root of 215545121 is about 599.5785197340.

The spelling of 215545121 in words is "two hundred fifteen million, five hundred forty-five thousand, one hundred twenty-one".