215222155213 has 6 divisors (see below), whose sum is σ = 233051209674. Its totient is φ = 198666604656.

The previous prime is 215222155189. The next prime is 215222155217. The reversal of 215222155213 is 312551222512.

It can be written as a sum of positive squares in 3 ways, for example, as 15754517289 + 199467637924 = 125517^2 + 446618^2 .

It is a de Polignac number, because none of the positive numbers 2^k-215222155213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215222155217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 636751770 + ... + 636752107.

It is an arithmetic number, because the mean of its divisors is an integer number (38841868279).

Almost surely, 2^215222155213 is an apocalyptic number.

It is an amenable number.

215222155213 is a deficient number, since it is larger than the sum of its proper divisors (17829054461).

215222155213 is a wasteful number, since it uses less digits than its factorization.

215222155213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273503903 (or 1273503890 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

Adding to 215222155213 its reverse (312551222512), we get a palindrome (527773377725).

The spelling of 215222155213 in words is "two hundred fifteen billion, two hundred twenty-two million, one hundred fifty-five thousand, two hundred thirteen".