21154503352 has 32 divisors (see below), whose sum is σ = 41113278720. Its totient is φ = 10197681120.

The previous prime is 21154503343. The next prime is 21154503353. The reversal of 21154503352 is 25330545112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154503353) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 394674 + ... + 445057.

It is an arithmetic number, because the mean of its divisors is an integer number (1284789960).

Almost surely, 2^21154503352 is an apocalyptic number.

It is an amenable number.

21154503352 is a deficient number, since it is larger than the sum of its proper divisors (19958775368).

21154503352 is a wasteful number, since it uses less digits than its factorization.

21154503352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839851 (or 839847 counting only the distinct ones).

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

The spelling of 21154503352 in words is "twenty-one billion, one hundred fifty-four million, five hundred three thousand, three hundred fifty-two".