421100144021 has 4 divisors (see below), whose sum is σ = 424129641600. Its totient is φ = 418070646444.

The previous prime is 421100143993. The next prime is 421100144027. The reversal of 421100144021 is 120441001124.

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 421100144021 - 2²² = 421095949717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421100143984 and 421100144002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421100144027) 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, 1514748581 + ... + 1514748858.

It is an arithmetic number, because the mean of its divisors is an integer number (106032410400).

Almost surely, 2^421100144021 is an apocalyptic number.

It is an amenable number.

421100144021 is a deficient number, since it is larger than the sum of its proper divisors (3029497579).

421100144021 is a wasteful number, since it uses less digits than its factorization.

421100144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029497578.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 421100144021 its reverse (120441001124), we get a palindrome (541541145145).

The spelling of 421100144021 in words is "four hundred twenty-one billion, one hundred million, one hundred forty-four thousand, twenty-one".