215225243121 has 32 divisors (see below), whose sum is σ = 329861878528. Its totient is φ = 122273867520.

The previous prime is 215225243113. The next prime is 215225243179. The reversal of 215225243121 is 121342522512.

215225243121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215225243121 - 2³ = 215225243113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215225243921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28416291 + ... + 28423863.

It is an arithmetic number, because the mean of its divisors is an integer number (10308183704).

Almost surely, 2^215225243121 is an apocalyptic number.

215225243121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

215225243121 is a deficient number, since it is larger than the sum of its proper divisors (114636635407).

215225243121 is a wasteful number, since it uses less digits than its factorization.

215225243121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15241.

The product of its digits is 9600, while the sum is 30.

Adding to 215225243121 its reverse (121342522512), we get a palindrome (336567765633).

The spelling of 215225243121 in words is "two hundred fifteen billion, two hundred twenty-five million, two hundred forty-three thousand, one hundred twenty-one".