210012491 has 8 divisors (see below), whose sum is σ = 238071120. Its totient is φ = 183654432.

The previous prime is 210012457. The next prime is 210012503. The reversal of 210012491 is 194210012.

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

It is not a de Polignac number, because 210012491 - 2⁶ = 210012427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210012401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424880 + ... + 425373.

It is an arithmetic number, because the mean of its divisors is an integer number (29758890).

Almost surely, 2^210012491 is an apocalyptic number.

210012491 is a deficient number, since it is larger than the sum of its proper divisors (28058629).

210012491 is a wasteful number, since it uses less digits than its factorization.

210012491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850285.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 210012491 is about 14491.8077202259. The cubic root of 210012491 is about 594.4039800473.

The spelling of 210012491 in words is "two hundred ten million, twelve thousand, four hundred ninety-one".