21154533215532 has 96 divisors (see below), whose sum is σ = 55019435385600. Its totient is φ = 6286895419392.

The previous prime is 21154533215531. The next prime is 21154533215567. The reversal of 21154533215532 is 23551233545112.

It is not an unprimeable number, because it can be changed into a prime (21154533215531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47970819 + ... + 48409797.

It is an arithmetic number, because the mean of its divisors is an integer number (573119118600).

Almost surely, 2^{21154533215532} is an apocalyptic number.

It is an amenable number.

21154533215532 is an abundant number, since it is smaller than the sum of its proper divisors (33864902170068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154533215532 is a wasteful number, since it uses less digits than its factorization.

21154533215532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451455 (or 451453 counting only the distinct ones).

The product of its digits is 540000, while the sum is 42.

The spelling of 21154533215532 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-three million, two hundred fifteen thousand, five hundred thirty-two".