122420421 has 12 divisors (see below), whose sum is σ = 184518048. Its totient is φ = 78065064.

The previous prime is 122420413. The next prime is 122420429. The reversal of 122420421 is 124024221.

122420421 is a `hidden beast` number, since 1 + 2 + 242 + 0 + 421 = 666.

It is an interprime number because it is at equal distance from previous prime (122420413) and next prime (122420429).

It is not a de Polignac number, because 122420421 - 2³ = 122420413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122420394 and 122420403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122420429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295495 + ... + 295908.

It is an arithmetic number, because the mean of its divisors is an integer number (15376504).

Almost surely, 2^122420421 is an apocalyptic number.

It is an amenable number.

122420421 is a deficient number, since it is larger than the sum of its proper divisors (62097627).

122420421 is a wasteful number, since it uses less digits than its factorization.

122420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591432 (or 591429 counting only the distinct ones).

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

The square root of 122420421 is about 11064.3762137773. The cubic root of 122420421 is about 496.5366268164.

Adding to 122420421 its reverse (124024221), we get a palindrome (246444642).

The spelling of 122420421 in words is "one hundred twenty-two million, four hundred twenty thousand, four hundred twenty-one".