21154533216252 has 12 divisors (see below), whose sum is σ = 49360577504616. Its totient is φ = 7051511072080.

The previous prime is 21154533216251. The next prime is 21154533216287. The reversal of 21154533216252 is 25261233545112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154533216251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881438883999 + ... + 881438884022.

It is an arithmetic number, because the mean of its divisors is an integer number (4113381458718).

Almost surely, 2^{21154533216252} is an apocalyptic number.

It is an amenable number.

21154533216252 is an abundant number, since it is smaller than the sum of its proper divisors (28206044288364).

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

21154533216252 is a wasteful number, since it uses less digits than its factorization.

21154533216252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762877768028 (or 1762877768026 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

The spelling of 21154533216252 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-three million, two hundred sixteen thousand, two hundred fifty-two".