210420012321 has 12 divisors (see below), whose sum is σ = 303945030948. Its totient is φ = 140277694464.

The previous prime is 210420012281. The next prime is 210420012349. The reversal of 210420012321 is 123210024012.

It is a happy number.

210420012321 is a `hidden beast` number, since 2 + 10 + 420 + 0 + 1 + 232 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 177884871696 + 32535140625 = 421764^2 + 180375^2 .

It is not a de Polignac number, because 210420012321 - 2¹⁷ = 210419881249 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210420012294 and 210420012303.

It is not an unprimeable number, because it can be changed into a prime (210420012371) 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, 523041 + ... + 833313.

It is an arithmetic number, because the mean of its divisors is an integer number (25328752579).

Almost surely, 2^210420012321 is an apocalyptic number.

It is an amenable number.

210420012321 is a deficient number, since it is larger than the sum of its proper divisors (93525018627).

210420012321 is a wasteful number, since it uses less digits than its factorization.

210420012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385632 (or 385629 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 210420012321 its reverse (123210024012), we get a palindrome (333630036333).

The spelling of 210420012321 in words is "two hundred ten billion, four hundred twenty million, twelve thousand, three hundred twenty-one".