210421087 has 8 divisors (see below), whose sum is σ = 229986432. Its totient is φ = 191654400.

The previous prime is 210421073. The next prime is 210421151. The reversal of 210421087 is 780124012.

It is a happy number.

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

It is not a de Polignac number, because 210421087 - 2¹¹ = 210419039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210421027) 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, 199114 + ... + 200167.

It is an arithmetic number, because the mean of its divisors is an integer number (28748304).

Almost surely, 2^210421087 is an apocalyptic number.

210421087 is a deficient number, since it is larger than the sum of its proper divisors (19565345).

210421087 is a wasteful number, since it uses less digits than its factorization.

210421087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399329.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 210421087 is about 14505.8983520498. The cubic root of 210421087 is about 594.7892170542.

Adding to 210421087 its reverse (780124012), we get a palindrome (990545099).

The spelling of 210421087 in words is "two hundred ten million, four hundred twenty-one thousand, eighty-seven".