21020432442434 has 16 divisors (see below), whose sum is σ = 31928433550272. Its totient is φ = 10377763303248.

The previous prime is 21020432442379. The next prime is 21020432442437. The reversal of 21020432442434 is 43424423402012.

It is a junction number, because it is equal to n+sod(n) for n = 21020432442394 and 21020432442403.

It is not an unprimeable number, because it can be changed into a prime (21020432442437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35214149 + ... + 35806104.

It is an arithmetic number, because the mean of its divisors is an integer number (1995527096892).

Almost surely, 2^{21020432442434} is an apocalyptic number.

21020432442434 is a deficient number, since it is larger than the sum of its proper divisors (10908001107838).

21020432442434 is a wasteful number, since it uses less digits than its factorization.

21020432442434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71022121.

The product of its (nonzero) digits is 147456, while the sum is 35.

Adding to 21020432442434 its reverse (43424423402012), we get a palindrome (64444855844446).

The spelling of 21020432442434 in words is "twenty-one trillion, twenty billion, four hundred thirty-two million, four hundred forty-two thousand, four hundred thirty-four".