21144234013 has 8 divisors (see below), whose sum is σ = 24171240128. Its totient is φ = 18118828224.

The previous prime is 21144233969. The next prime is 21144234019. The reversal of 21144234013 is 31043244112.

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

It is not a de Polignac number, because 21144234013 - 2²¹ = 21142136861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144234019) 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, 371631 + ... + 424732.

It is an arithmetic number, because the mean of its divisors is an integer number (3021405016).

Almost surely, 2^21144234013 is an apocalyptic number.

It is an amenable number.

21144234013 is a deficient number, since it is larger than the sum of its proper divisors (3027006115).

21144234013 is an equidigital number, since it uses as much as digits as its factorization.

21144234013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800163.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21144234013 its reverse (31043244112), we get a palindrome (52187478125).

The spelling of 21144234013 in words is "twenty-one billion, one hundred forty-four million, two hundred thirty-four thousand, thirteen".