210504421 has 12 divisors (see below), whose sum is σ = 226787040. Its totient is φ = 195312320.

The previous prime is 210504403. The next prime is 210504443. The reversal of 210504421 is 124405012.

210504421 is a nontrivial binomial coefficient, being equal to C(20519, 2).

It is not a de Polignac number, because 210504421 - 2¹⁷ = 210373349 is a prime.

It is a super-2 number, since 2×210504421² = 88624222521090482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210504461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15390 + ... + 25648.

It is an arithmetic number, because the mean of its divisors is an integer number (18898920).

Almost surely, 2^210504421 is an apocalyptic number.

210504421 is the 20518-th triangular number.

210504421 is the 6840-th centered nonagonal number.

It is an amenable number.

210504421 is a deficient number, since it is larger than the sum of its proper divisors (16282619).

210504421 is a wasteful number, since it uses less digits than its factorization.

210504421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10364 (or 10347 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 210504421 is about 14508.7704854684. The cubic root of 210504421 is about 594.8677256984.

Adding to 210504421 its reverse (124405012), we get a palindrome (334909433).

It can be divided in two parts, 210504 and 421, that added together give a triangular number (210925 = T₆₄₉).

The spelling of 210504421 in words is "two hundred ten million, five hundred four thousand, four hundred twenty-one".