21243012030434 has 16 divisors (see below), whose sum is σ = 32725950637248. Its totient is φ = 10334365842672.

The previous prime is 21243012030377. The next prime is 21243012030469. The reversal of 21243012030434 is 43403021034212.

It is a junction number, because it is equal to n+sod(n) for n = 21243012030397 and 21243012030406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10505819 + ... + 12363585.

It is an arithmetic number, because the mean of its divisors is an integer number (2045371914828).

Almost surely, 2^{21243012030434} is an apocalyptic number.

21243012030434 is a deficient number, since it is larger than the sum of its proper divisors (11482938606814).

21243012030434 is a wasteful number, since it uses less digits than its factorization.

21243012030434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012329.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21243012030434 its reverse (43403021034212), we get a palindrome (64646033064646).

The spelling of 21243012030434 in words is "twenty-one trillion, two hundred forty-three billion, twelve million, thirty thousand, four hundred thirty-four".