421344424421 has 8 divisors (see below), whose sum is σ = 424273839000. Its totient is φ = 418416364800.

The previous prime is 421344424409. The next prime is 421344424447. The reversal of 421344424421 is 124424443124.

It can be written as a sum of positive squares in 4 ways, for example, as 28278121921 + 393066302500 = 168161^2 + 626950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421344424421 is a prime.

It is a super-2 number, since 2×421344424421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421344424471) 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, 289385 + ... + 962513.

It is an arithmetic number, because the mean of its divisors is an integer number (53034229875).

Almost surely, 2^421344424421 is an apocalyptic number.

It is an amenable number.

421344424421 is a deficient number, since it is larger than the sum of its proper divisors (2929414579).

421344424421 is a wasteful number, since it uses less digits than its factorization.

421344424421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677479.

The product of its digits is 98304, while the sum is 35.

Adding to 421344424421 its reverse (124424443124), we get a palindrome (545768867545).

The spelling of 421344424421 in words is "four hundred twenty-one billion, three hundred forty-four million, four hundred twenty-four thousand, four hundred twenty-one".