21513053504103 has 12 divisors (see below), whose sum is σ = 33367185027000. Its totient is φ = 12293173430832.

The previous prime is 21513053504101. The next prime is 21513053504123. The reversal of 21513053504103 is 30140535031512.

It is not a de Polignac number, because 21513053504103 - 2¹ = 21513053504101 is a prime.

It is a super-2 number, since 2×21513053504103² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513053504101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73173651228 + ... + 73173651521.

It is an arithmetic number, because the mean of its divisors is an integer number (2780598752250).

Almost surely, 2^{21513053504103} is an apocalyptic number.

21513053504103 is a deficient number, since it is larger than the sum of its proper divisors (11854131522897).

21513053504103 is a wasteful number, since it uses less digits than its factorization.

21513053504103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146347302766 (or 146347302759 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

Adding to 21513053504103 its reverse (30140535031512), we get a palindrome (51653588535615).

The spelling of 21513053504103 in words is "twenty-one trillion, five hundred thirteen billion, fifty-three million, five hundred four thousand, one hundred three".