21515411543143 has 32 divisors (see below), whose sum is σ = 25754135016960. Its totient is φ = 17583999941760.

The previous prime is 21515411543099. The next prime is 21515411543149. The reversal of 21515411543143 is 34134511451512.

It is not a de Polignac number, because 21515411543143 - 2²⁵ = 21515377988711 is a prime.

It is a super-2 number, since 2×21515411543143² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21515411543096 and 21515411543105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515411543149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40358121 + ... + 40887757.

It is an arithmetic number, because the mean of its divisors is an integer number (804816719280).

Almost surely, 2^{21515411543143} is an apocalyptic number.

21515411543143 is a deficient number, since it is larger than the sum of its proper divisors (4238723473817).

21515411543143 is a wasteful number, since it uses less digits than its factorization.

21515411543143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532167.

The product of its digits is 144000, while the sum is 40.

Adding to 21515411543143 its reverse (34134511451512), we get a palindrome (55649922994655).

The spelling of 21515411543143 in words is "twenty-one trillion, five hundred fifteen billion, four hundred eleven million, five hundred forty-three thousand, one hundred forty-three".