210421420 has 36 divisors (see below), whose sum is σ = 485713872. Its totient is φ = 76516000.

The previous prime is 210421417. The next prime is 210421423. The reversal of 210421420 is 24124012.

It is an interprime number because it is at equal distance from previous prime (210421417) and next prime (210421423).

It is a junction number, because it is equal to n+sod(n) for n = 210421394 and 210421403.

It is not an unprimeable number, because it can be changed into a prime (210421423) 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 11 ways as a sum of consecutive naturals, for example, 41056 + ... + 45895.

It is an arithmetic number, because the mean of its divisors is an integer number (13492052).

Almost surely, 2^210421420 is an apocalyptic number.

210421420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210421420 is an abundant number, since it is smaller than the sum of its proper divisors (275292452).

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

210421420 is a wasteful number, since it uses less digits than its factorization.

210421420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86982 (or 86969 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 210421420 is about 14505.9098301348. The cubic root of 210421420 is about 594.7895308134.

Adding to 210421420 its reverse (24124012), we get a palindrome (234545432).

The spelling of 210421420 in words is "two hundred ten million, four hundred twenty-one thousand, four hundred twenty".