21430420012 has 6 divisors (see below), whose sum is σ = 37503235028. Its totient is φ = 10715210004.

The previous prime is 21430420009. The next prime is 21430420013. The reversal of 21430420012 is 21002403412.

It is not an unprimeable number, because it can be changed into a prime (21430420013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678802498 + ... + 2678802505.

Almost surely, 2^21430420012 is an apocalyptic number.

It is an amenable number.

21430420012 is a deficient number, since it is larger than the sum of its proper divisors (16072815016).

21430420012 is a wasteful number, since it uses less digits than its factorization.

21430420012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357605007 (or 5357605005 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21430420012 its reverse (21002403412), we get a palindrome (42432823424).

The spelling of 21430420012 in words is "twenty-one billion, four hundred thirty million, four hundred twenty thousand, twelve".