21115123531043 has 8 divisors (see below), whose sum is σ = 22307980841280. Its totient is φ = 19953249527680.

The previous prime is 21115123531031. The next prime is 21115123531069. The reversal of 21115123531043 is 34013532151112.

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 21115123531043 - 2²⁶ = 21115056422179 is a prime.

It is a super-3 number, since 3×21115123531043³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21115123530043) 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, 7745825318 + ... + 7745828043.

It is an arithmetic number, because the mean of its divisors is an integer number (2788497605160).

Almost surely, 2^{21115123531043} is an apocalyptic number.

21115123531043 is a deficient number, since it is larger than the sum of its proper divisors (1192857310237).

21115123531043 is a wasteful number, since it uses less digits than its factorization.

21115123531043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15491653437.

The product of its (nonzero) digits is 10800, while the sum is 32.

Adding to 21115123531043 its reverse (34013532151112), we get a palindrome (55128655682155).

The spelling of 21115123531043 in words is "twenty-one trillion, one hundred fifteen billion, one hundred twenty-three million, five hundred thirty-one thousand, forty-three".