21434540400443 has 4 divisors (see below), whose sum is σ = 21435084339480. Its totient is φ = 21433996461408.

The previous prime is 21434540400331. The next prime is 21434540400487. The reversal of 21434540400443 is 34400404543412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21434540400443 - 2³² = 21430245433147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21434540400397 and 21434540400406.

It is not an unprimeable number, because it can be changed into a prime (21434540408443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271910405 + ... + 271989222.

It is an arithmetic number, because the mean of its divisors is an integer number (5358771084870).

Almost surely, 2^{21434540400443} is an apocalyptic number.

21434540400443 is a deficient number, since it is larger than the sum of its proper divisors (543939037).

21434540400443 is an equidigital number, since it uses as much as digits as its factorization.

21434540400443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543939036.

The product of its (nonzero) digits is 368640, while the sum is 38.

Adding to 21434540400443 its reverse (34400404543412), we get a palindrome (55834944943855).

The spelling of 21434540400443 in words is "twenty-one trillion, four hundred thirty-four billion, five hundred forty million, four hundred thousand, four hundred forty-three".