215313021241 has 4 divisors (see below), whose sum is σ = 215317485684. Its totient is φ = 215308556800.

The previous prime is 215313021239. The next prime is 215313021251. The reversal of 215313021241 is 142120313512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 193177830400 + 22135190841 = 439520^2 + 148779^2 .

It is a cyclic number.

It is not a de Polignac number, because 215313021241 - 2¹ = 215313021239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215313021211) 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, 2159080 + ... + 2256601.

It is an arithmetic number, because the mean of its divisors is an integer number (53829371421).

Almost surely, 2^215313021241 is an apocalyptic number.

It is an amenable number.

215313021241 is a deficient number, since it is larger than the sum of its proper divisors (4464443).

215313021241 is an equidigital number, since it uses as much as digits as its factorization.

215313021241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464442.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 215313021241 its reverse (142120313512), we get a palindrome (357433334753).

The spelling of 215313021241 in words is "two hundred fifteen billion, three hundred thirteen million, twenty-one thousand, two hundred forty-one".