21144545293 has 4 divisors (see below), whose sum is σ = 21156406048. Its totient is φ = 21132684540.

The previous prime is 21144545281. The next prime is 21144545327. The reversal of 21144545293 is 39254544112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21144545293 - 2⁹ = 21144544781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144545263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5927703 + ... + 5931268.

It is an arithmetic number, because the mean of its divisors is an integer number (5289101512).

Almost surely, 2^21144545293 is an apocalyptic number.

It is an amenable number.

21144545293 is a deficient number, since it is larger than the sum of its proper divisors (11860755).

21144545293 is a wasteful number, since it uses less digits than its factorization.

21144545293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11860754.

The product of its digits is 172800, while the sum is 40.

The spelling of 21144545293 in words is "twenty-one billion, one hundred forty-four million, five hundred forty-five thousand, two hundred ninety-three".