21513534403043 has 8 divisors (see below), whose sum is σ = 21638175942000. Its totient is φ = 21388896150048.

The previous prime is 21513534402979. The next prime is 21513534403079. The reversal of 21513534403043 is 34030443531512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21513534403043 - 2⁶ = 21513534402979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21513534402988 and 21513534403006.

It is not an unprimeable number, because it can be changed into a prime (21513534403093) 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, 12980348 + ... + 14543606.

It is an arithmetic number, because the mean of its divisors is an integer number (2704771992750).

Almost surely, 2^{21513534403043} is an apocalyptic number.

21513534403043 is a deficient number, since it is larger than the sum of its proper divisors (124641538957).

21513534403043 is a wasteful number, since it uses less digits than its factorization.

21513534403043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642981.

The product of its (nonzero) digits is 259200, while the sum is 38.

Adding to 21513534403043 its reverse (34030443531512), we get a palindrome (55543977934555).

The spelling of 21513534403043 in words is "twenty-one trillion, five hundred thirteen billion, five hundred thirty-four million, four hundred three thousand, forty-three".