420042321 has 16 divisors (see below), whose sum is σ = 623133120. Its totient is φ = 279646560.

The previous prime is 420042317. The next prime is 420042323. The reversal of 420042321 is 123240024.

It is not a de Polignac number, because 420042321 - 2² = 420042317 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 420042294 and 420042303.

It is not an unprimeable number, because it can be changed into a prime (420042323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10326 + ... + 30768.

It is an arithmetic number, because the mean of its divisors is an integer number (38945820).

Almost surely, 2^420042321 is an apocalyptic number.

It is an amenable number.

420042321 is a deficient number, since it is larger than the sum of its proper divisors (203090799).

420042321 is a wasteful number, since it uses less digits than its factorization.

420042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21213 (or 21207 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 420042321 is about 20494.9340325847. The cubic root of 420042321 is about 748.9123915729.

Adding to 420042321 its reverse (123240024), we get a palindrome (543282345).

The spelling of 420042321 in words is "four hundred twenty million, forty-two thousand, three hundred twenty-one".