215220520722240 has 1008 divisors, whose sum is σ = 886527702379200. Its totient is φ = 49105504419840.

The previous prime is 215220520722191. The next prime is 215220520722241. The reversal of 215220520722240 is 42227025022512.

215220520722240 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 2 + 0 + 520 + 72 + 22 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 215220520722195 and 215220520722204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215220520722241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 301775991 + ... + 302488329.

Almost surely, 2^{215220520722240} is an apocalyptic number.

215220520722240 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 215220520722240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443263851189600).

215220520722240 is an abundant number, since it is smaller than the sum of its proper divisors (671307181656960).

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

215220520722240 is a wasteful number, since it uses less digits than its factorization.

215220520722240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712421 (or 712377 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 36.

Adding to 215220520722240 its reverse (42227025022512), we get a palindrome (257447545744752).

The spelling of 215220520722240 in words is "two hundred fifteen trillion, two hundred twenty billion, five hundred twenty million, seven hundred twenty-two thousand, two hundred forty".