21242075112 has 24 divisors (see below), whose sum is σ = 57530620290. Its totient is φ = 7080691680.

The previous prime is 21242075081. The next prime is 21242075137. The reversal of 21242075112 is 21157024212.

It is a happy number.

21242075112 is a `hidden beast` number, since 2 + 124 + 20 + 7 + 511 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20820758436 + 421316676 = 144294^2 + 20526^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147514339 + ... + 147514482.

Almost surely, 2^21242075112 is an apocalyptic number.

It is an amenable number.

21242075112 is an abundant number, since it is smaller than the sum of its proper divisors (36288545178).

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

21242075112 is a wasteful number, since it uses less digits than its factorization.

21242075112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295028833 (or 295028826 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

Adding to 21242075112 its reverse (21157024212), we get a palindrome (42399099324).

The spelling of 21242075112 in words is "twenty-one billion, two hundred forty-two million, seventy-five thousand, one hundred twelve".