211257401686 has 8 divisors (see below), whose sum is σ = 316903931640. Its totient is φ = 105622757808.

The previous prime is 211257401671. The next prime is 211257401701. The reversal of 211257401686 is 686104752112.

211257401686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (211257401671) and next prime (211257401701).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2926951 + ... + 2998258.

It is an arithmetic number, because the mean of its divisors is an integer number (39612991455).

Almost surely, 2^211257401686 is an apocalyptic number.

211257401686 is a deficient number, since it is larger than the sum of its proper divisors (105646529954).

211257401686 is a wasteful number, since it uses less digits than its factorization.

211257401686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943038.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 211257401686 in words is "two hundred eleven billion, two hundred fifty-seven million, four hundred one thousand, six hundred eighty-six".