21543332354434 has 16 divisors (see below), whose sum is σ = 35340637719456. Its totient is φ = 9768003784000.

The previous prime is 21543332354431. The next prime is 21543332354587. The reversal of 21543332354434 is 43445323334512.

It is not an unprimeable number, because it can be changed into a prime (21543332354431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1220991652 + ... + 1221009295.

It is an arithmetic number, because the mean of its divisors is an integer number (2208789857466).

Almost surely, 2^{21543332354434} is an apocalyptic number.

21543332354434 is a deficient number, since it is larger than the sum of its proper divisors (13797305365022).

21543332354434 is a wasteful number, since it uses less digits than its factorization.

21543332354434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442001361.

The product of its digits is 6220800, while the sum is 46.

Adding to 21543332354434 its reverse (43445323334512), we get a palindrome (64988655688946).

The spelling of 21543332354434 in words is "twenty-one trillion, five hundred forty-three billion, three hundred thirty-two million, three hundred fifty-four thousand, four hundred thirty-four".