21120012441 has 32 divisors (see below), whose sum is σ = 36141206400. Its totient is φ = 12047063040.

The previous prime is 21120012437. The next prime is 21120012491. The reversal of 21120012441 is 14421002112.

21120012441 is a `hidden beast` number, since 2 + 11 + 200 + 12 + 441 = 666.

It is not a de Polignac number, because 21120012441 - 2² = 21120012437 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120012401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2086456 + ... + 2096553.

It is an arithmetic number, because the mean of its divisors is an integer number (1129412700).

Almost surely, 2^21120012441 is an apocalyptic number.

It is an amenable number.

21120012441 is a deficient number, since it is larger than the sum of its proper divisors (15021193959).

21120012441 is a wasteful number, since it uses less digits than its factorization.

21120012441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4183046 (or 4183040 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21120012441 its reverse (14421002112), we get a palindrome (35541014553).

The spelling of 21120012441 in words is "twenty-one billion, one hundred twenty million, twelve thousand, four hundred forty-one".