21104051243 has 8 divisors (see below), whose sum is σ = 24376872240. Its totient is φ = 18056942080.

The previous prime is 21104051183. The next prime is 21104051251. The reversal of 21104051243 is 34215040112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21104051243 - 2⁶ = 21104051179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21104059243) 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 7 ways as a sum of consecutive naturals, for example, 56427758 + ... + 56428131.

It is an arithmetic number, because the mean of its divisors is an integer number (3047109030).

Almost surely, 2^21104051243 is an apocalyptic number.

21104051243 is a deficient number, since it is larger than the sum of its proper divisors (3272820997).

21104051243 is a wasteful number, since it uses less digits than its factorization.

21104051243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112855917.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21104051243 its reverse (34215040112), we get a palindrome (55319091355).

The spelling of 21104051243 in words is "twenty-one billion, one hundred four million, fifty-one thousand, two hundred forty-three".