21118758210 has 448 divisors, whose sum is σ = 66633477120. Its totient is φ = 4763111040.

The previous prime is 21118758107. The next prime is 21118758239. The reversal of 21118758210 is 1285781112.

21118758210 is a `hidden beast` number, since 211 + 187 + 58 + 210 = 666.

It is an unprimeable number.

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 223 ways as a sum of consecutive naturals, for example, 126459547 + ... + 126459713.

It is an arithmetic number, because the mean of its divisors is an integer number (148735440).

Almost surely, 2^21118758210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21118758210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33316738560).

21118758210 is an abundant number, since it is smaller than the sum of its proper divisors (45514718910).

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

21118758210 is a wasteful number, since it uses less digits than its factorization.

21118758210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 36.

The spelling of 21118758210 in words is "twenty-one billion, one hundred eighteen million, seven hundred fifty-eight thousand, two hundred ten".