21543030434356 has 12 divisors (see below), whose sum is σ = 37717385424768. Its totient is φ = 10766634598712.

The previous prime is 21543030434339. The next prime is 21543030434417. The reversal of 21543030434356 is 65343403034512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1220144686 + ... + 1220162341.

It is an arithmetic number, because the mean of its divisors is an integer number (3143115452064).

Almost surely, 2^{21543030434356} is an apocalyptic number.

It is an amenable number.

21543030434356 is a deficient number, since it is larger than the sum of its proper divisors (16174354990412).

21543030434356 is a wasteful number, since it uses less digits than its factorization.

21543030434356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440309238 (or 2440309236 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 43.

Adding to 21543030434356 its reverse (65343403034512), we get a palindrome (86886433468868).

The spelling of 21543030434356 in words is "twenty-one trillion, five hundred forty-three billion, thirty million, four hundred thirty-four thousand, three hundred fifty-six".