421042143421 has 4 divisors (see below), whose sum is σ = 424977116832. Its totient is φ = 417107170012.

The previous prime is 421042143407. The next prime is 421042143433. The reversal of 421042143421 is 124341240124.

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.

It is a cyclic number.

It is not a de Polignac number, because 421042143421 - 2¹⁹ = 421041619133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421042143421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421042143451) 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, 1967486545 + ... + 1967486758.

It is an arithmetic number, because the mean of its divisors is an integer number (106244279208).

Almost surely, 2^421042143421 is an apocalyptic number.

It is an amenable number.

421042143421 is a deficient number, since it is larger than the sum of its proper divisors (3934973411).

421042143421 is a wasteful number, since it uses less digits than its factorization.

421042143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934973410.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 421042143421 its reverse (124341240124), we get a palindrome (545383383545).

The spelling of 421042143421 in words is "four hundred twenty-one billion, forty-two million, one hundred forty-three thousand, four hundred twenty-one".