210421164 has 12 divisors (see below), whose sum is σ = 490982744. Its totient is φ = 70140384.

The previous prime is 210421163. The next prime is 210421193. The reversal of 210421164 is 461124012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×210421164² = 88554132518229792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210421164.

It is not an unprimeable number, because it can be changed into a prime (210421163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8767537 + ... + 8767560.

Almost surely, 2^210421164 is an apocalyptic number.

It is an amenable number.

210421164 is an abundant number, since it is smaller than the sum of its proper divisors (280561580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210421164 is a wasteful number, since it uses less digits than its factorization.

210421164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17535104 (or 17535102 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 210421164 is about 14505.9010061423. The cubic root of 210421164 is about 594.7892896051.

Adding to 210421164 its reverse (461124012), we get a palindrome (671545176).

The spelling of 210421164 in words is "two hundred ten million, four hundred twenty-one thousand, one hundred sixty-four".