210221420 has 24 divisors (see below), whose sum is σ = 453398064. Its totient is φ = 81815616.

The previous prime is 210221393. The next prime is 210221441. The reversal of 210221420 is 24122012.

It is a junction number, because it is equal to n+sod(n) for n = 210221395 and 210221404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141302 + ... + 142781.

It is an arithmetic number, because the mean of its divisors is an integer number (18891586).

Almost surely, 2^210221420 is an apocalyptic number.

210221420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221420 is an abundant number, since it is smaller than the sum of its proper divisors (243176644).

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

210221420 is a wasteful number, since it uses less digits than its factorization.

210221420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284129 (or 284127 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 210221420 is about 14499.0144492652. The cubic root of 210221420 is about 594.6010271670.

Adding to 210221420 its reverse (24122012), we get a palindrome (234343432).

The spelling of 210221420 in words is "two hundred ten million, two hundred twenty-one thousand, four hundred twenty".