21411434421 has 24 divisors (see below), whose sum is σ = 33365937696. Its totient is φ = 13152823200.

The previous prime is 21411434417. The next prime is 21411434453. The reversal of 21411434421 is 12443411412.

21411434421 is a `hidden beast` number, since 214 + 1 + 1 + 4 + 3 + 442 + 1 = 666.

It is not a de Polignac number, because 21411434421 - 2² = 21411434417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411434411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96655 + ... + 228396.

It is an arithmetic number, because the mean of its divisors is an integer number (1390247404).

Almost surely, 2^21411434421 is an apocalyptic number.

It is an amenable number.

21411434421 is a deficient number, since it is larger than the sum of its proper divisors (11954503275).

21411434421 is a wasteful number, since it uses less digits than its factorization.

21411434421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325633 (or 325630 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 21411434421 its reverse (12443411412), we get a palindrome (33854845833).

The spelling of 21411434421 in words is "twenty-one billion, four hundred eleven million, four hundred thirty-four thousand, four hundred twenty-one".