210934281691 has 12 divisors (see below), whose sum is σ = 259806211128. Its totient is φ = 170165470272.

The previous prime is 210934281683. The next prime is 210934281743. The reversal of 210934281691 is 196182439012.

It is not a de Polignac number, because 210934281691 - 2³ = 210934281683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210934281191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126610381 + ... + 126612046.

It is an arithmetic number, because the mean of its divisors is an integer number (21650517594).

Almost surely, 2^210934281691 is an apocalyptic number.

210934281691 is a deficient number, since it is larger than the sum of its proper divisors (48871929437).

210934281691 is a wasteful number, since it uses less digits than its factorization.

210934281691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253222458 (or 253222451 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 210934281691 in words is "two hundred ten billion, nine hundred thirty-four million, two hundred eighty-one thousand, six hundred ninety-one".