21043201421 has 8 divisors (see below), whose sum is σ = 22962054144. Its totient is φ = 19125321120.

The previous prime is 21043201391. The next prime is 21043201441. The reversal of 21043201421 is 12410234012.

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

It is a cyclic number.

It is not a de Polignac number, because 21043201421 - 2¹⁸ = 21042939277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21043201393 and 21043201402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043201441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197480 + ... + 284753.

It is an arithmetic number, because the mean of its divisors is an integer number (2870256768).

Almost surely, 2^21043201421 is an apocalyptic number.

It is an amenable number.

21043201421 is a deficient number, since it is larger than the sum of its proper divisors (1918852723).

21043201421 is a wasteful number, since it uses less digits than its factorization.

21043201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486211.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21043201421 its reverse (12410234012), we get a palindrome (33453435433).

The spelling of 21043201421 in words is "twenty-one billion, forty-three million, two hundred one thousand, four hundred twenty-one".