21115323214531 has 8 divisors (see below), whose sum is σ = 25988090110304. Its totient is φ = 16706629356480.

The previous prime is 21115323214501. The next prime is 21115323214537. The reversal of 21115323214531 is 13541232351112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21115323214531 - 2¹⁹ = 21115322690243 is a prime.

It is a super-2 number, since 2×21115323214531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21115323214537) 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 7 ways as a sum of consecutive naturals, for example, 116018259330 + ... + 116018259511.

It is an arithmetic number, because the mean of its divisors is an integer number (3248511263788).

Almost surely, 2^{21115323214531} is an apocalyptic number.

21115323214531 is a deficient number, since it is larger than the sum of its proper divisors (4872766895773).

21115323214531 is a wasteful number, since it uses less digits than its factorization.

21115323214531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232036518861.

The product of its digits is 21600, while the sum is 34.

Adding to 21115323214531 its reverse (13541232351112), we get a palindrome (34656555565643).

The spelling of 21115323214531 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-three million, two hundred fourteen thousand, five hundred thirty-one".