211685421 has 8 divisors (see below), whose sum is σ = 282648160. Its totient is φ = 140923152.

The previous prime is 211685387. The next prime is 211685429. The reversal of 211685421 is 124586112.

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

It is not a de Polignac number, because 211685421 - 2¹⁰ = 211684397 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211685429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47635 + ... + 51888.

It is an arithmetic number, because the mean of its divisors is an integer number (35331020).

Almost surely, 2^211685421 is an apocalyptic number.

It is an amenable number.

211685421 is a deficient number, since it is larger than the sum of its proper divisors (70962739).

211685421 is an equidigital number, since it uses as much as digits as its factorization.

211685421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100235.

The product of its digits is 3840, while the sum is 30.

The square root of 211685421 is about 14549.4130809459. The cubic root of 211685421 is about 595.9781204901.

The spelling of 211685421 in words is "two hundred eleven million, six hundred eighty-five thousand, four hundred twenty-one".