543640334411021 has 16 divisors (see below), whose sum is σ = 557784572829120. Its totient is φ = 529661064764160.

The previous prime is 543640334411017. The next prime is 543640334411063. The reversal of 543640334411021 is 120114433046345.

It is a cyclic number.

It is not a de Polignac number, because 543640334411021 - 2² = 543640334411017 is a prime.

It is a super-2 number, since 2×543640334411021² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 543640334411021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543640334411071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96759551 + ... + 102223731.

It is an arithmetic number, because the mean of its divisors is an integer number (34861535801820).

Almost surely, 2^{543640334411021} is an apocalyptic number.

It is an amenable number.

543640334411021 is a deficient number, since it is larger than the sum of its proper divisors (14144238418099).

543640334411021 is a wasteful number, since it uses less digits than its factorization.

543640334411021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5479276.

The product of its (nonzero) digits is 414720, while the sum is 41.

Adding to 543640334411021 its reverse (120114433046345), we get a palindrome (663754767457366).

The spelling of 543640334411021 in words is "five hundred forty-three trillion, six hundred forty billion, three hundred thirty-four million, four hundred eleven thousand, twenty-one".