21144545332 has 12 divisors (see below), whose sum is σ = 37024771140. Its totient is φ = 10566039296.

The previous prime is 21144545327. The next prime is 21144545353. The reversal of 21144545332 is 23354544112.

It can be written as a sum of positive squares in 2 ways, for example, as 17191405456 + 3953139876 = 131116^2 + 62874^2 .

It is a congruent number.

It is an unprimeable number.

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, 1550707 + ... + 1564282.

It is an arithmetic number, because the mean of its divisors is an integer number (3085397595).

Almost surely, 2^21144545332 is an apocalyptic number.

It is an amenable number.

21144545332 is a deficient number, since it is larger than the sum of its proper divisors (15880225808).

21144545332 is a wasteful number, since it uses less digits than its factorization.

21144545332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116690 (or 3116688 counting only the distinct ones).

The product of its digits is 57600, while the sum is 34.

The spelling of 21144545332 in words is "twenty-one billion, one hundred forty-four million, five hundred forty-five thousand, three hundred thirty-two".