215512223211 has 24 divisors (see below), whose sum is σ = 325147426240. Its totient is φ = 142641161352.

The previous prime is 215512223207. The next prime is 215512223233. The reversal of 215512223211 is 112322215512.

215512223211 is a `hidden beast` number, since 215 + 5 + 12 + 223 + 211 = 666.

It is not a de Polignac number, because 215512223211 - 2² = 215512223207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215512223261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3156445 + ... + 3223998.

Almost surely, 2^215512223211 is an apocalyptic number.

215512223211 is a deficient number, since it is larger than the sum of its proper divisors (109635203029).

215512223211 is an equidigital number, since it uses as much as digits as its factorization.

215512223211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6380597 (or 6380585 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 215512223211 its reverse (112322215512), we get a palindrome (327834438723).

The spelling of 215512223211 in words is "two hundred fifteen billion, five hundred twelve million, two hundred twenty-three thousand, two hundred eleven".