215464641776420 has 48 divisors (see below), whose sum is σ = 464706950953728. Its totient is φ = 83856125059200.

The previous prime is 215464641776369. The next prime is 215464641776467. The reversal of 215464641776420 is 24677146464512.

It is a self number, because there is not a number n which added to its sum of digits gives 215464641776420.

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, 202934249 + ... + 203993231.

It is an arithmetic number, because the mean of its divisors is an integer number (9681394811536).

Almost surely, 2^{215464641776420} is an apocalyptic number.

215464641776420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215464641776420 is an abundant number, since it is smaller than the sum of its proper divisors (249242309177308).

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

215464641776420 is a wasteful number, since it uses less digits than its factorization.

215464641776420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333980 (or 1333978 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 59.

The spelling of 215464641776420 in words is "two hundred fifteen trillion, four hundred sixty-four billion, six hundred forty-one million, seven hundred seventy-six thousand, four hundred twenty".