21430414521 has 12 divisors (see below), whose sum is σ = 31033020772. Its totient is φ = 14250953376.

The previous prime is 21430414501. The next prime is 21430414529. The reversal of 21430414521 is 12541403412.

21430414521 is a `hidden beast` number, since 214 + 30 + 414 + 5 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11262515625 + 10167898896 = 106125^2 + 100836^2 .

It is not a de Polignac number, because 21430414521 - 2¹⁰ = 21430413497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21430414529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2995366 + ... + 3002511.

Almost surely, 2^21430414521 is an apocalyptic number.

It is an amenable number.

21430414521 is a deficient number, since it is larger than the sum of its proper divisors (9602606251).

21430414521 is a wasteful number, since it uses less digits than its factorization.

21430414521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5998280 (or 5998277 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21430414521 its reverse (12541403412), we get a palindrome (33971817933).

The spelling of 21430414521 in words is "twenty-one billion, four hundred thirty million, four hundred fourteen thousand, five hundred twenty-one".