215212501220 has 12 divisors (see below), whose sum is σ = 451946252604. Its totient is φ = 86085000480.

The previous prime is 215212501211. The next prime is 215212501289. The reversal of 215212501220 is 22105212512.

It can be written as a sum of positive squares in 2 ways, for example, as 110654691904 + 104557809316 = 332648^2 + 323354^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5380312511 + ... + 5380312550.

It is an arithmetic number, because the mean of its divisors is an integer number (37662187717).

Almost surely, 2^215212501220 is an apocalyptic number.

215212501220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215212501220 is an abundant number, since it is smaller than the sum of its proper divisors (236733751384).

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

215212501220 is a wasteful number, since it uses less digits than its factorization.

215212501220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10760625070 (or 10760625068 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 215212501220 its reverse (22105212512), we get a palindrome (237317713732).

The spelling of 215212501220 in words is "two hundred fifteen billion, two hundred twelve million, five hundred one thousand, two hundred twenty".