215711100072 has 48 divisors (see below), whose sum is σ = 629157377940. Its totient is φ = 66372645888.

The previous prime is 215711100043. The next prime is 215711100079. The reversal of 215711100072 is 270001117512.

215711100072 is a `hidden beast` number, since 21 + 571 + 1 + 1 + 0 + 0 + 0 + 72 = 666.

215711100072 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 204280496676 + 11430603396 = 451974^2 + 106914^2 .

It is not an unprimeable number, because it can be changed into a prime (215711100079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115229353 + ... + 115231224.

Almost surely, 2^215711100072 is an apocalyptic number.

It is an amenable number.

215711100072 is an abundant number, since it is smaller than the sum of its proper divisors (413446277868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215711100072 is a wasteful number, since it uses less digits than its factorization.

215711100072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230460602 (or 230460595 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 27.

Adding to 215711100072 its reverse (270001117512), we get a palindrome (485712217584).

The spelling of 215711100072 in words is "two hundred fifteen billion, seven hundred eleven million, one hundred thousand, seventy-two".