21155523152 has 20 divisors (see below), whose sum is σ = 42096633396. Its totient is φ = 10291875840.

The previous prime is 21155523127. The next prime is 21155523209. The reversal of 21155523152 is 25132555112.

It can be written as a sum of positive squares in 2 ways, for example, as 12484933696 + 8670589456 = 111736^2 + 93116^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 17867249 + ... + 17868432.

Almost surely, 2^21155523152 is an apocalyptic number.

It is an amenable number.

21155523152 is a deficient number, since it is larger than the sum of its proper divisors (20941110244).

21155523152 is a wasteful number, since it uses less digits than its factorization.

21155523152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35735726 (or 35735720 counting only the distinct ones).

The product of its digits is 15000, while the sum is 32.

The spelling of 21155523152 in words is "twenty-one billion, one hundred fifty-five million, five hundred twenty-three thousand, one hundred fifty-two".