215122221211 has 4 divisors (see below), whose sum is σ = 226444443400. Its totient is φ = 203799999024.

The previous prime is 215122221199. The next prime is 215122221217. The reversal of 215122221211 is 112122221512.

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

It is a cyclic number.

It is not a de Polignac number, because 215122221211 - 2¹¹ = 215122219163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215122221217) 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, 5661111066 + ... + 5661111103.

It is an arithmetic number, because the mean of its divisors is an integer number (56611110850).

Almost surely, 2^215122221211 is an apocalyptic number.

215122221211 is a deficient number, since it is larger than the sum of its proper divisors (11322222189).

215122221211 is a wasteful number, since it uses less digits than its factorization.

215122221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11322222188.

The product of its digits is 320, while the sum is 22.

Adding to 215122221211 its reverse (112122221512), we get a palindrome (327244442723).

The spelling of 215122221211 in words is "two hundred fifteen billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred eleven".