21812934851700 has 144 divisors (see below), whose sum is σ = 65292873905280. Its totient is φ = 5615816532480.

The previous prime is 21812934851689. The next prime is 21812934851717. The reversal of 21812934851700 is 715843921812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138886617 + ... + 139043583.

Almost surely, 2^{21812934851700} is an apocalyptic number.

21812934851700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21812934851700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32646436952640).

21812934851700 is an abundant number, since it is smaller than the sum of its proper divisors (43479939053580).

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

21812934851700 is a wasteful number, since it uses less digits than its factorization.

21812934851700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172986 (or 172979 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 21812934851700 in words is "twenty-one trillion, eight hundred twelve billion, nine hundred thirty-four million, eight hundred fifty-one thousand, seven hundred".