421411043004221 has 4 divisors (see below), whose sum is σ = 428553603055200. Its totient is φ = 414268482953244.

The previous prime is 421411043004181. The next prime is 421411043004239. The reversal of 421411043004221 is 122400340114124.

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 a de Polignac number, because none of the positive numbers 2^k-421411043004221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421411043004521) 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, 3571280025401 + ... + 3571280025518.

It is an arithmetic number, because the mean of its divisors is an integer number (107138400763800).

Almost surely, 2^{421411043004221} is an apocalyptic number.

It is an amenable number.

421411043004221 is a deficient number, since it is larger than the sum of its proper divisors (7142560050979).

421411043004221 is an equidigital number, since it uses as much as digits as its factorization.

421411043004221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142560050978.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 421411043004221 its reverse (122400340114124), we get a palindrome (543811383118345).

The spelling of 421411043004221 in words is "four hundred twenty-one trillion, four hundred eleven billion, forty-three million, four thousand, two hundred twenty-one".