215445243213 has 24 divisors (see below), whose sum is σ = 332947702880. Its totient is φ = 133840006560.

The previous prime is 215445243163. The next prime is 215445243227. The reversal of 215445243213 is 312342544512.

It is a happy number.

215445243213 is a `hidden beast` number, since 2 + 1 + 544 + 52 + 43 + 21 + 3 = 666.

It is not a de Polignac number, because 215445243213 - 2¹² = 215445239117 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 (215445243313) 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, 10316731 + ... + 10337592.

Almost surely, 2^215445243213 is an apocalyptic number.

It is an amenable number.

215445243213 is a deficient number, since it is larger than the sum of its proper divisors (117502459667).

215445243213 is a wasteful number, since it uses less digits than its factorization.

215445243213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20654409 (or 20654406 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 215445243213 its reverse (312342544512), we get a palindrome (527787787725).

The spelling of 215445243213 in words is "two hundred fifteen billion, four hundred forty-five million, two hundred forty-three thousand, two hundred thirteen".