21550753008 has 60 divisors (see below), whose sum is σ = 61942250968. Its totient is φ = 6989431680.

The previous prime is 21550752997. The next prime is 21550753009. The reversal of 21550753008 is 80035705512.

21550753008 is a `hidden beast` number, since 2 + 1 + 550 + 75 + 30 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550753009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2017078 + ... + 2027733.

Almost surely, 2^21550753008 is an apocalyptic number.

It is an amenable number.

21550753008 is an abundant number, since it is smaller than the sum of its proper divisors (40391497960).

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

21550753008 is a wasteful number, since it uses less digits than its factorization.

21550753008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044862 (or 4044853 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 21550753008 in words is "twenty-one billion, five hundred fifty million, seven hundred fifty-three thousand, eight".