21411430521 has 16 divisors (see below), whose sum is σ = 32553126144. Its totient is φ = 12401190144.

The previous prime is 21411430471. The next prime is 21411430529. The reversal of 21411430521 is 12503411412.

It is not a de Polignac number, because 21411430521 - 2⁹ = 21411430009 is a prime.

It is a super-2 number, since 2×21411430521² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21411430491 and 21411430500.

It is not an unprimeable number, because it can be changed into a prime (21411430529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16146721 + ... + 16148046.

It is an arithmetic number, because the mean of its divisors is an integer number (2034570384).

Almost surely, 2^21411430521 is an apocalyptic number.

It is an amenable number.

21411430521 is a deficient number, since it is larger than the sum of its proper divisors (11141695623).

21411430521 is a wasteful number, since it uses less digits than its factorization.

21411430521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32294800.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21411430521 its reverse (12503411412), we get a palindrome (33914841933).

The spelling of 21411430521 in words is "twenty-one billion, four hundred eleven million, four hundred thirty thousand, five hundred twenty-one".