21513053504102 has 4 divisors (see below), whose sum is σ = 32269580256156. Its totient is φ = 10756526752050.

The previous prime is 21513053504101. The next prime is 21513053504123. The reversal of 21513053504102 is 20140535031512.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21513053504102² (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 as a sum of consecutive naturals, namely, 5378263376024 + ... + 5378263376027.

It is an arithmetic number, because the mean of its divisors is an integer number (8067395064039).

Almost surely, 2^{21513053504102} is an apocalyptic number.

21513053504102 is a deficient number, since it is larger than the sum of its proper divisors (10756526752054).

21513053504102 is a wasteful number, since it uses less digits than its factorization.

21513053504102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10756526752053.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 21513053504102 its reverse (20140535031512), we get a palindrome (41653588535614).

The spelling of 21513053504102 in words is "twenty-one trillion, five hundred thirteen billion, fifty-three million, five hundred four thousand, one hundred two".