215255103240 has 128 divisors (see below), whose sum is σ = 679901040000. Its totient is φ = 54368391168.

The previous prime is 215255103223. The next prime is 215255103253. The reversal of 215255103240 is 42301552512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 215255103198 and 215255103207.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15763936 + ... + 15777584.

It is an arithmetic number, because the mean of its divisors is an integer number (5311726875).

Almost surely, 2^215255103240 is an apocalyptic number.

215255103240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215255103240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339950520000).

215255103240 is an abundant number, since it is smaller than the sum of its proper divisors (464645936760).

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

215255103240 is a wasteful number, since it uses less digits than its factorization.

215255103240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20599 (or 20595 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 215255103240 its reverse (42301552512), we get a palindrome (257556655752).

The spelling of 215255103240 in words is "two hundred fifteen billion, two hundred fifty-five million, one hundred three thousand, two hundred forty".