21124035043 has 4 divisors (see below), whose sum is σ = 21144173400. Its totient is φ = 21103896688.

The previous prime is 21124035017. The next prime is 21124035059. The reversal of 21124035043 is 34053042112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21124035043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21124034999 and 21124035017.

It is not an unprimeable number, because it can be changed into a prime (21124035013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10067605 + ... + 10069702.

It is an arithmetic number, because the mean of its divisors is an integer number (5286043350).

Almost surely, 2^21124035043 is an apocalyptic number.

21124035043 is a deficient number, since it is larger than the sum of its proper divisors (20138357).

21124035043 is a wasteful number, since it uses less digits than its factorization.

21124035043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20138356.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21124035043 its reverse (34053042112), we get a palindrome (55177077155).

The spelling of 21124035043 in words is "twenty-one billion, one hundred twenty-four million, thirty-five thousand, forty-three".