215343121 has 16 divisors (see below), whose sum is σ = 248684800. Its totient is φ = 182658240.

The previous prime is 215343119. The next prime is 215343151. The reversal of 215343121 is 121343512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 215343121 - 2¹ = 215343119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215343092 and 215343101.

It is not an unprimeable number, because it can be changed into a prime (215343101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441940 + ... + 442426.

It is an arithmetic number, because the mean of its divisors is an integer number (15542800).

Almost surely, 2^215343121 is an apocalyptic number.

It is an amenable number.

215343121 is a deficient number, since it is larger than the sum of its proper divisors (33341679).

215343121 is a wasteful number, since it uses less digits than its factorization.

215343121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its digits is 720, while the sum is 22.

The square root of 215343121 is about 14674.5739631514. The cubic root of 215343121 is about 599.3911611047.

Adding to 215343121 its reverse (121343512), we get a palindrome (336686633).

The spelling of 215343121 in words is "two hundred fifteen million, three hundred forty-three thousand, one hundred twenty-one".