21000555324 has 72 divisors (see below), whose sum is σ = 60739687008. Its totient is φ = 5993095680.

The previous prime is 21000555319. The next prime is 21000555377. The reversal of 21000555324 is 42355500012.

It is a happy number.

21000555324 is a `hidden beast` number, since 2 + 100 + 0 + 5 + 553 + 2 + 4 = 666.

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 23 ways as a sum of consecutive naturals, for example, 167344 + ... + 264584.

It is an arithmetic number, because the mean of its divisors is an integer number (843606764).

Almost surely, 2^21000555324 is an apocalyptic number.

It is an amenable number.

21000555324 is an abundant number, since it is smaller than the sum of its proper divisors (39739131684).

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

21000555324 is a wasteful number, since it uses less digits than its factorization.

21000555324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98115 (or 98110 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The spelling of 21000555324 in words is "twenty-one billion, five hundred fifty-five thousand, three hundred twenty-four".