420331203221 has 4 divisors (see below), whose sum is σ = 422653475244. Its totient is φ = 418008931200.

The previous prime is 420331203217. The next prime is 420331203293. The reversal of 420331203221 is 122302133024.

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 200806156996 + 219525046225 = 448114^2 + 468535^2 .

It is a cyclic number.

It is not a de Polignac number, because 420331203221 - 2² = 420331203217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420331206221) 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, 1161135740 + ... + 1161136101.

It is an arithmetic number, because the mean of its divisors is an integer number (105663368811).

Almost surely, 2^420331203221 is an apocalyptic number.

It is an amenable number.

420331203221 is a deficient number, since it is larger than the sum of its proper divisors (2322272023).

420331203221 is a wasteful number, since it uses less digits than its factorization.

420331203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322272022.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 420331203221 its reverse (122302133024), we get a palindrome (542633336245).

The spelling of 420331203221 in words is "four hundred twenty billion, three hundred thirty-one million, two hundred three thousand, two hundred twenty-one".