21111435043 has 4 divisors (see below), whose sum is σ = 21560614560. Its totient is φ = 20662255528.

The previous prime is 21111435041. The next prime is 21111435049. The reversal of 21111435043 is 34053411112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111435043 - 2¹ = 21111435041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111434999 and 21111435017.

It is not an unprimeable number, because it can be changed into a prime (21111435041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224589688 + ... + 224589781.

It is an arithmetic number, because the mean of its divisors is an integer number (5390153640).

Almost surely, 2^21111435043 is an apocalyptic number.

21111435043 is a deficient number, since it is larger than the sum of its proper divisors (449179517).

21111435043 is an equidigital number, since it uses as much as digits as its factorization.

21111435043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449179516.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21111435043 its reverse (34053411112), we get a palindrome (55164846155).

The spelling of 21111435043 in words is "twenty-one billion, one hundred eleven million, four hundred thirty-five thousand, forty-three".