210001421 has 8 divisors (see below), whose sum is σ = 240089280. Its totient is φ = 179935488.

The previous prime is 210001417. The next prime is 210001439. The reversal of 210001421 is 124100012.

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 210001421 - 2² = 210001417 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 (210001481) 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, 34925 + ... + 40493.

It is an arithmetic number, because the mean of its divisors is an integer number (30011160).

Almost surely, 2^210001421 is an apocalyptic number.

It is an amenable number.

210001421 is a deficient number, since it is larger than the sum of its proper divisors (30087859).

210001421 is an equidigital number, since it uses as much as digits as its factorization.

210001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10963.

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

The square root of 210001421 is about 14491.4257752645. The cubic root of 210001421 is about 594.3935359579.

Adding to 210001421 its reverse (124100012), we get a palindrome (334101433).

The spelling of 210001421 in words is "two hundred ten million, one thousand, four hundred twenty-one".