217381180406 has 48 divisors (see below), whose sum is σ = 370342891584. Its totient is φ = 95540919552.

The previous prime is 217381180363. The next prime is 217381180411. The reversal of 217381180406 is 604081183712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402866 + ... + 772698.

It is an arithmetic number, because the mean of its divisors is an integer number (7715476908).

Almost surely, 2^217381180406 is an apocalyptic number.

217381180406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

217381180406 is a deficient number, since it is larger than the sum of its proper divisors (152961711178).

217381180406 is a wasteful number, since it uses less digits than its factorization.

217381180406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369945 (or 369932 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 217381180406 in words is "two hundred seventeen billion, three hundred eighty-one million, one hundred eighty thousand, four hundred six".