21513051131503 has 8 divisors (see below), whose sum is σ = 22037932472976. Its totient is φ = 20988178017600.

The previous prime is 21513051131497. The next prime is 21513051131521. The reversal of 21513051131503 is 30513115031512.

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 21513051131503 - 2⁵ = 21513051131471 is a prime.

It is a super-2 number, since 2×21513051131503² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513051131203) 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, 3411625 + ... + 7393597.

It is an arithmetic number, because the mean of its divisors is an integer number (2754741559122).

Almost surely, 2^{21513051131503} is an apocalyptic number.

21513051131503 is a deficient number, since it is larger than the sum of its proper divisors (524881341473).

21513051131503 is a wasteful number, since it uses less digits than its factorization.

21513051131503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113785.

The product of its (nonzero) digits is 6750, while the sum is 31.

The spelling of 21513051131503 in words is "twenty-one trillion, five hundred thirteen billion, fifty-one million, one hundred thirty-one thousand, five hundred three".