21430443051 has 10 divisors (see below), whose sum is σ = 32013378012. Its totient is φ = 14286961980.

The previous prime is 21430443043. The next prime is 21430443077. The reversal of 21430443051 is 15034403412.

It is a happy number.

21430443051 is a `hidden beast` number, since 214 + 3 + 0 + 443 + 0 + 5 + 1 = 666.

It is not a de Polignac number, because 21430443051 - 2³ = 21430443043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21430441051) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 132286605 + ... + 132286766.

Almost surely, 2^21430443051 is an apocalyptic number.

21430443051 is a deficient number, since it is larger than the sum of its proper divisors (10582934961).

21430443051 is an equidigital number, since it uses as much as digits as its factorization.

21430443051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264573383 (or 264573374 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21430443051 its reverse (15034403412), we get a palindrome (36464846463).

The spelling of 21430443051 in words is "twenty-one billion, four hundred thirty million, four hundred forty-three thousand, fifty-one".