21755650112 has 112 divisors (see below), whose sum is σ = 49988370432. Its totient is φ = 9201738240.

The previous prime is 21755650073. The next prime is 21755650117. The reversal of 21755650112 is 21105655712.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×21755650112² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21755650117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17672537 + ... + 17673767.

It is an arithmetic number, because the mean of its divisors is an integer number (446324736).

Almost surely, 2^21755650112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21755650112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24994185216).

21755650112 is an abundant number, since it is smaller than the sum of its proper divisors (28232720320).

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

21755650112 is a wasteful number, since it uses less digits than its factorization.

21755650112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736 (or 1726 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 21755650112 in words is "twenty-one billion, seven hundred fifty-five million, six hundred fifty thousand, one hundred twelve".