210420553 has 8 divisors (see below), whose sum is σ = 245388800. Its totient is φ = 180360180.

The previous prime is 210420541. The next prime is 210420571. The reversal of 210420553 is 355024012.

It is a de Polignac number, because none of the positive numbers 2^k-210420553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210420533) 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, 306393 + ... + 307078.

It is an arithmetic number, because the mean of its divisors is an integer number (30673600).

Almost surely, 2^210420553 is an apocalyptic number.

It is an amenable number.

210420553 is a deficient number, since it is larger than the sum of its proper divisors (34968247).

210420553 is an frugal number, since it uses more digits than its factorization.

210420553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613492 (or 613478 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 210420553 is about 14505.8799457324. The cubic root of 210420553 is about 594.7887139080.

Adding to 210420553 its reverse (355024012), we get a palindrome (565444565).

The spelling of 210420553 in words is "two hundred ten million, four hundred twenty thousand, five hundred fifty-three".