21115361520143 has 32 divisors (see below), whose sum is σ = 23520536939520. Its totient is φ = 18795801024000.

The previous prime is 21115361520061. The next prime is 21115361520163. The reversal of 21115361520143 is 34102516351112.

It is a happy number.

It is not a de Polignac number, because 21115361520143 - 2²⁰ = 21115360471567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115361520163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51318971 + ... + 51728787.

It is an arithmetic number, because the mean of its divisors is an integer number (735016779360).

Almost surely, 2^{21115361520143} is an apocalyptic number.

21115361520143 is a deficient number, since it is larger than the sum of its proper divisors (2405175419377).

21115361520143 is a wasteful number, since it uses less digits than its factorization.

21115361520143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410399.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 21115361520143 its reverse (34102516351112), we get a palindrome (55217877871255).

The spelling of 21115361520143 in words is "twenty-one trillion, one hundred fifteen billion, three hundred sixty-one million, five hundred twenty thousand, one hundred forty-three".