42321420121 has 4 divisors (see below), whose sum is σ = 42331375332. Its totient is φ = 42311464912.

The previous prime is 42321420103. The next prime is 42321420143. The reversal of 42321420121 is 12102412324.

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 15466404496 + 26855015625 = 124364^2 + 163875^2 .

It is a cyclic number.

It is not a de Polignac number, because 42321420121 - 2⁷ = 42321419993 is a prime.

It is a super-2 number, since 2×42321420121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42321420092 and 42321420101.

It is not an unprimeable number, because it can be changed into a prime (42321420191) 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, 4971226 + ... + 4979731.

It is an arithmetic number, because the mean of its divisors is an integer number (10582843833).

Almost surely, 2^42321420121 is an apocalyptic number.

It is an amenable number.

42321420121 is a deficient number, since it is larger than the sum of its proper divisors (9955211).

42321420121 is an equidigital number, since it uses as much as digits as its factorization.

42321420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9955210.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 42321420121 its reverse (12102412324), we get a palindrome (54423832445).

The spelling of 42321420121 in words is "forty-two billion, three hundred twenty-one million, four hundred twenty thousand, one hundred twenty-one".