21044243435 has 8 divisors (see below), whose sum is σ = 25385308416. Its totient is φ = 16747250560.

The previous prime is 21044243401. The next prime is 21044243449. The reversal of 21044243435 is 53434244012.

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

It is not a de Polignac number, because 21044243435 - 2⁸ = 21044243179 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11016974 + ... + 11018883.

It is an arithmetic number, because the mean of its divisors is an integer number (3173163552).

Almost surely, 2^21044243435 is an apocalyptic number.

21044243435 is a deficient number, since it is larger than the sum of its proper divisors (4341064981).

21044243435 is a wasteful number, since it uses less digits than its factorization.

21044243435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22036053.

The product of its (nonzero) digits is 46080, while the sum is 32.

Adding to 21044243435 its reverse (53434244012), we get a palindrome (74478487447).

The spelling of 21044243435 in words is "twenty-one billion, forty-four million, two hundred forty-three thousand, four hundred thirty-five".