21851016858600 has 48 divisors (see below), whose sum is σ = 67738152263520. Its totient is φ = 5826937828800.

The previous prime is 21851016858571. The next prime is 21851016858679. The reversal of 21851016858600 is 685861015812.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18209180116 + ... + 18209181315.

It is an arithmetic number, because the mean of its divisors is an integer number (1411211505490).

Almost surely, 2^{21851016858600} is an apocalyptic number.

21851016858600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21851016858600 is an abundant number, since it is smaller than the sum of its proper divisors (45887135404920).

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

21851016858600 is a wasteful number, since it uses less digits than its factorization.

21851016858600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36418361450 (or 36418361441 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 51.

The spelling of 21851016858600 in words is "twenty-one trillion, eight hundred fifty-one billion, sixteen million, eight hundred fifty-eight thousand, six hundred".