21144552452 has 24 divisors (see below), whose sum is σ = 37700208000. Its totient is φ = 10374775136.

The previous prime is 21144552421. The next prime is 21144552461. The reversal of 21144552452 is 25425544112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164252 + ... + 263187.

It is an arithmetic number, because the mean of its divisors is an integer number (1570842000).

Almost surely, 2^21144552452 is an apocalyptic number.

It is an amenable number.

21144552452 is a deficient number, since it is larger than the sum of its proper divisors (16555655548).

21144552452 is a wasteful number, since it uses less digits than its factorization.

21144552452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427675 (or 427673 counting only the distinct ones).

The product of its digits is 64000, while the sum is 35.

The spelling of 21144552452 in words is "twenty-one billion, one hundred forty-four million, five hundred fifty-two thousand, four hundred fifty-two".