215531241211 has 8 divisors (see below), whose sum is σ = 253211528304. Its totient is φ = 180865377120.

The previous prime is 215531241209. The next prime is 215531241217. The reversal of 215531241211 is 112142135512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215531241211 - 2¹ = 215531241209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215531241211.

It is not an unprimeable number, because it can be changed into a prime (215531241217) 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, 753605596 + ... + 753605881.

It is an arithmetic number, because the mean of its divisors is an integer number (31651441038).

Almost surely, 2^215531241211 is an apocalyptic number.

215531241211 is a deficient number, since it is larger than the sum of its proper divisors (37680287093).

215531241211 is a wasteful number, since it uses less digits than its factorization.

215531241211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507211501.

The product of its digits is 2400, while the sum is 28.

Adding to 215531241211 its reverse (112142135512), we get a palindrome (327673376723).

The spelling of 215531241211 in words is "two hundred fifteen billion, five hundred thirty-one million, two hundred forty-one thousand, two hundred eleven".