21100140043 has 4 divisors (see below), whose sum is σ = 21107245048. Its totient is φ = 21093035040.

The previous prime is 21100140023. The next prime is 21100140137. The reversal of 21100140043 is 34004100112.

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 21100140043 - 2⁵ = 21100140011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100139999 and 21100140026.

It is not an unprimeable number, because it can be changed into a prime (21100140013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3548046 + ... + 3553987.

It is an arithmetic number, because the mean of its divisors is an integer number (5276811262).

Almost surely, 2^21100140043 is an apocalyptic number.

21100140043 is a deficient number, since it is larger than the sum of its proper divisors (7105005).

21100140043 is an equidigital number, since it uses as much as digits as its factorization.

21100140043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7105004.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21100140043 its reverse (34004100112), we get a palindrome (55104240155).

The spelling of 21100140043 in words is "twenty-one billion, one hundred million, one hundred forty thousand, forty-three".