210421001 has 8 divisors (see below), whose sum is σ = 241533120. Its totient is φ = 179571888.

The previous prime is 210420989. The next prime is 210421027. The reversal of 210421001 is 100124012.

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

It is a cyclic number.

It is not a de Polignac number, because 210421001 - 2¹⁸ = 210158857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210421051) 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, 64031 + ... + 67236.

It is an arithmetic number, because the mean of its divisors is an integer number (30191640).

Almost surely, 2^210421001 is an apocalyptic number.

It is an amenable number.

210421001 is a deficient number, since it is larger than the sum of its proper divisors (31112119).

210421001 is a wasteful number, since it uses less digits than its factorization.

210421001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131503.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 210421001 is about 14505.8953877380. The cubic root of 210421001 is about 594.7891360232.

Adding to 210421001 its reverse (100124012), we get a palindrome (310545013).

The spelling of 210421001 in words is "two hundred ten million, four hundred twenty-one thousand, one".