21150244243 has 6 divisors (see below), whose sum is σ = 21904712804. Its totient is φ = 20420924664.

The previous prime is 21150244237. The next prime is 21150244267. The reversal of 21150244243 is 34244205112.

It is not a de Polignac number, because 21150244243 - 2⁹ = 21150243731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21150244273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12573621 + ... + 12575302.

Almost surely, 2^21150244243 is an apocalyptic number.

21150244243 is a deficient number, since it is larger than the sum of its proper divisors (754468561).

21150244243 is an equidigital number, since it uses as much as digits as its factorization.

21150244243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25148981 (or 25148952 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21150244243 its reverse (34244205112), we get a palindrome (55394449355).

The spelling of 21150244243 in words is "twenty-one billion, one hundred fifty million, two hundred forty-four thousand, two hundred forty-three".