21102204043 has 4 divisors (see below), whose sum is σ = 21672533920. Its totient is φ = 20531874168.

The previous prime is 21102204041. The next prime is 21102204073. The reversal of 21102204043 is 34040220112.

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 21102204043 - 2¹ = 21102204041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21102204043.

It is not an unprimeable number, because it can be changed into a prime (21102204041) 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, 285164883 + ... + 285164956.

It is an arithmetic number, because the mean of its divisors is an integer number (5418133480).

Almost surely, 2^21102204043 is an apocalyptic number.

21102204043 is a deficient number, since it is larger than the sum of its proper divisors (570329877).

21102204043 is an equidigital number, since it uses as much as digits as its factorization.

21102204043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570329876.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21102204043 its reverse (34040220112), we get a palindrome (55142424155).

The spelling of 21102204043 in words is "twenty-one billion, one hundred two million, two hundred four thousand, forty-three".