215421343241 has 4 divisors (see below), whose sum is σ = 231992215812. Its totient is φ = 198850470672.

The previous prime is 215421343229. The next prime is 215421343253. The reversal of 215421343241 is 142343124512.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (215421343229) and next prime (215421343253).

It can be written as a sum of positive squares in 2 ways, for example, as 23257470016 + 192163873225 = 152504^2 + 438365^2 .

It is a cyclic number.

It is not a de Polignac number, because 215421343241 - 2²⁶ = 215354234377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215421343198 and 215421343207.

It is not an unprimeable number, because it can be changed into a prime (215421343201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8285436266 + ... + 8285436291.

It is an arithmetic number, because the mean of its divisors is an integer number (57998053953).

Almost surely, 2^215421343241 is an apocalyptic number.

It is an amenable number.

215421343241 is a deficient number, since it is larger than the sum of its proper divisors (16570872571).

215421343241 is a wasteful number, since it uses less digits than its factorization.

215421343241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16570872570.

The product of its digits is 23040, while the sum is 32.

Adding to 215421343241 its reverse (142343124512), we get a palindrome (357764467753).

The spelling of 215421343241 in words is "two hundred fifteen billion, four hundred twenty-one million, three hundred forty-three thousand, two hundred forty-one".