211445516516520 has 128 divisors (see below), whose sum is σ = 745234547783040. Its totient is φ = 47316479216640.

The previous prime is 211445516516503. The next prime is 211445516516581. The reversal of 211445516516520 is 25615615544112.

It is a self number, because there is not a number n which added to its sum of digits gives 211445516516520.

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, 6160982739 + ... + 6161017058.

It is an arithmetic number, because the mean of its divisors is an integer number (5822144904555).

Almost surely, 2^{211445516516520} is an apocalyptic number.

211445516516520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211445516516520 is an abundant number, since it is smaller than the sum of its proper divisors (533789031266520).

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

211445516516520 is a wasteful number, since it uses less digits than its factorization.

211445516516520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12321999835 (or 12321999831 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 48.

The spelling of 211445516516520 in words is "two hundred eleven trillion, four hundred forty-five billion, five hundred sixteen million, five hundred sixteen thousand, five hundred twenty".