420212421 has 8 divisors (see below), whose sum is σ = 622536960. Its totient is φ = 280141596.

The previous prime is 420212411. The next prime is 420212423. The reversal of 420212421 is 124212024.

420212421 is a `hidden beast` number, since 420 + 2 + 1 + 242 + 1 = 666.

It is not a de Polignac number, because 420212421 - 2⁵ = 420212389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420212394 and 420212403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420212423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7781685 + ... + 7781738.

It is an arithmetic number, because the mean of its divisors is an integer number (77817120).

Almost surely, 2^420212421 is an apocalyptic number.

It is an amenable number.

420212421 is a deficient number, since it is larger than the sum of its proper divisors (202324539).

420212421 is a wasteful number, since it uses less digits than its factorization.

420212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15563432 (or 15563426 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 420212421 is about 20499.0834185336. The cubic root of 420212421 is about 749.0134709161.

Adding to 420212421 its reverse (124212024), we get a palindrome (544424445).

The spelling of 420212421 in words is "four hundred twenty million, two hundred twelve thousand, four hundred twenty-one".