21100230343 has 4 divisors (see below), whose sum is σ = 21187783408. Its totient is φ = 21012677280.

The previous prime is 21100230331. The next prime is 21100230373. The reversal of 21100230343 is 34303200112.

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 21100230343 - 2¹⁷ = 21100099271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21100230343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100230313) 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, 43776171 + ... + 43776652.

It is an arithmetic number, because the mean of its divisors is an integer number (5296945852).

Almost surely, 2^21100230343 is an apocalyptic number.

21100230343 is a deficient number, since it is larger than the sum of its proper divisors (87553065).

21100230343 is an equidigital number, since it uses as much as digits as its factorization.

21100230343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87553064.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21100230343 its reverse (34303200112), we get a palindrome (55403430455).

The spelling of 21100230343 in words is "twenty-one billion, one hundred million, two hundred thirty thousand, three hundred forty-three".