215135440024 has 128 divisors (see below), whose sum is σ = 460637337600. Its totient is φ = 93718840320.

The previous prime is 215135439979. The next prime is 215135440027. The reversal of 215135440024 is 420044531512.

It is a super-2 number, since 2×215135440024² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215135440027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7482444 + ... + 7511140.

It is an arithmetic number, because the mean of its divisors is an integer number (3598729200).

Almost surely, 2^215135440024 is an apocalyptic number.

It is an amenable number.

215135440024 is an abundant number, since it is smaller than the sum of its proper divisors (245501897576).

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

215135440024 is a wasteful number, since it uses less digits than its factorization.

215135440024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28833 (or 28829 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 215135440024 its reverse (420044531512), we get a palindrome (635179971536).

The spelling of 215135440024 in words is "two hundred fifteen billion, one hundred thirty-five million, four hundred forty thousand, twenty-four".