420212321 has 4 divisors (see below), whose sum is σ = 430461444. Its totient is φ = 409963200.

The previous prime is 420212281. The next prime is 420212327. The reversal of 420212321 is 123212024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133079296 + 287133025 = 11536^2 + 16945^2 .

It is a cyclic number.

It is not a de Polignac number, because 420212321 - 2⁶ = 420212257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 420212321.

It is not an unprimeable number, because it can be changed into a prime (420212327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124500 + ... + 5124581.

It is an arithmetic number, because the mean of its divisors is an integer number (107615361).

Almost surely, 2^420212321 is an apocalyptic number.

420212321 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

420212321 is a deficient number, since it is larger than the sum of its proper divisors (10249123).

420212321 is a wasteful number, since it uses less digits than its factorization.

420212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10249122.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 420212321 is about 20499.0809794000. The cubic root of 420212321 is about 749.0134115007.

Adding to 420212321 its reverse (123212024), we get a palindrome (543424345).

The spelling of 420212321 in words is "four hundred twenty million, two hundred twelve thousand, three hundred twenty-one".