21052533145 has 32 divisors (see below), whose sum is σ = 29377313280. Its totient is φ = 14184875520.

The previous prime is 21052533113. The next prime is 21052533169. The reversal of 21052533145 is 54133525012.

It is not a de Polignac number, because 21052533145 - 2⁵ = 21052533113 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 671980 + ... + 702610.

It is an arithmetic number, because the mean of its divisors is an integer number (918041040).

Almost surely, 2^21052533145 is an apocalyptic number.

It is an amenable number.

21052533145 is a deficient number, since it is larger than the sum of its proper divisors (8324780135).

21052533145 is a wasteful number, since it uses less digits than its factorization.

21052533145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30985.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21052533145 in words is "twenty-one billion, fifty-two million, five hundred thirty-three thousand, one hundred forty-five".