21411203421 has 8 divisors (see below), whose sum is σ = 28566779200. Its totient is φ = 14264881632.

The previous prime is 21411203381. The next prime is 21411203453. The reversal of 21411203421 is 12430211412.

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

It is not a de Polignac number, because 21411203421 - 2²¹ = 21409106269 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 (21411203521) 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, 2308096 + ... + 2317353.

It is an arithmetic number, because the mean of its divisors is an integer number (3570847400).

Almost surely, 2^21411203421 is an apocalyptic number.

It is an amenable number.

21411203421 is a deficient number, since it is larger than the sum of its proper divisors (7155575779).

21411203421 is a wasteful number, since it uses less digits than its factorization.

21411203421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626995.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21411203421 its reverse (12430211412), we get a palindrome (33841414833).

The spelling of 21411203421 in words is "twenty-one billion, four hundred eleven million, two hundred three thousand, four hundred twenty-one".