21144303345 has 32 divisors (see below), whose sum is σ = 36913065984. Its totient is φ = 10249937600.

The previous prime is 21144303337. The next prime is 21144303353. The reversal of 21144303345 is 54330344112.

It is an interprime number because it is at equal distance from previous prime (21144303337) and next prime (21144303353).

It is not a de Polignac number, because 21144303345 - 2³ = 21144303337 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1529434 + ... + 1543196.

It is an arithmetic number, because the mean of its divisors is an integer number (1153533312).

Almost surely, 2^21144303345 is an apocalyptic number.

It is an amenable number.

21144303345 is a deficient number, since it is larger than the sum of its proper divisors (15768762639).

21144303345 is a wasteful number, since it uses less digits than its factorization.

21144303345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23093.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21144303345 its reverse (54330344112), we get a palindrome (75474647457).

The spelling of 21144303345 in words is "twenty-one billion, one hundred forty-four million, three hundred three thousand, three hundred forty-five".