21100227750 has 192 divisors, whose sum is σ = 65613749760. Its totient is φ = 4792737600.

The previous prime is 21100227703. The next prime is 21100227763. The reversal of 21100227750 is 5772200112.

It is a super-2 number, since 2×21100227750² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2563141 + ... + 2571359.

It is an arithmetic number, because the mean of its divisors is an integer number (341738280).

Almost surely, 2^21100227750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21100227750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32806874880).

21100227750 is an abundant number, since it is smaller than the sum of its proper divisors (44513522010).

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

21100227750 is a wasteful number, since it uses less digits than its factorization.

21100227750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8412 (or 8399 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

Adding to 21100227750 its reverse (5772200112), we get a palindrome (26872427862).

The spelling of 21100227750 in words is "twenty-one billion, one hundred million, two hundred twenty-seven thousand, seven hundred fifty".