21927851100 has 108 divisors (see below), whose sum is σ = 68768036064. Its totient is φ = 5844330240.

The previous prime is 21927851089. The next prime is 21927851111. The reversal of 21927851100 is 115872912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21927851089) and next prime (21927851111).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2061997 + ... + 2072603.

Almost surely, 2^21927851100 is an apocalyptic number.

21927851100 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 21927851100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34384018032).

21927851100 is an abundant number, since it is smaller than the sum of its proper divisors (46840184964).

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

21927851100 is a wasteful number, since it uses less digits than its factorization.

21927851100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12924 (or 12914 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The spelling of 21927851100 in words is "twenty-one billion, nine hundred twenty-seven million, eight hundred fifty-one thousand, one hundred".