421242121 has 4 divisors (see below), whose sum is σ = 421283200. Its totient is φ = 421201044.

The previous prime is 421242091. The next prime is 421242131. The reversal of 421242121 is 121242124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 421242121 - 2¹¹ = 421240073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421242131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9100 + ... + 30418.

It is an arithmetic number, because the mean of its divisors is an integer number (105320800).

Almost surely, 2^421242121 is an apocalyptic number.

It is an amenable number.

421242121 is a deficient number, since it is larger than the sum of its proper divisors (41079).

421242121 is a wasteful number, since it uses less digits than its factorization.

421242121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41078.

The product of its digits is 256, while the sum is 19.

The square root of 421242121 is about 20524.1838083759. The cubic root of 421242121 is about 749.6247728967.

Adding to 421242121 its reverse (121242124), we get a palindrome (542484245).

The spelling of 421242121 in words is "four hundred twenty-one million, two hundred forty-two thousand, one hundred twenty-one".