215440420404 has 48 divisors (see below), whose sum is σ = 560061766656. Its totient is φ = 63895932000.

The previous prime is 215440420397. The next prime is 215440420417. The reversal of 215440420404 is 404024044512.

215440420404 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17356822 + ... + 17369229.

It is an arithmetic number, because the mean of its divisors is an integer number (11667953472).

Almost surely, 2^215440420404 is an apocalyptic number.

It is an amenable number.

215440420404 is an abundant number, since it is smaller than the sum of its proper divisors (344621346252).

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

215440420404 is a wasteful number, since it uses less digits than its factorization.

215440420404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34726116 (or 34726114 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 30.

Adding to 215440420404 its reverse (404024044512), we get a palindrome (619464464916).

The spelling of 215440420404 in words is "two hundred fifteen billion, four hundred forty million, four hundred twenty thousand, four hundred four".