21113000441 has 4 divisors (see below), whose sum is σ = 22737077412. Its totient is φ = 19488923472.

The previous prime is 21113000437. The next prime is 21113000449. The reversal of 21113000441 is 14400031112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4188031225 + 16924969216 = 64715^2 + 130096^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113000441 - 2² = 21113000437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113000449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812038466 + ... + 812038491.

It is an arithmetic number, because the mean of its divisors is an integer number (5684269353).

Almost surely, 2^21113000441 is an apocalyptic number.

It is an amenable number.

21113000441 is a deficient number, since it is larger than the sum of its proper divisors (1624076971).

21113000441 is a wasteful number, since it uses less digits than its factorization.

21113000441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624076970.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21113000441 its reverse (14400031112), we get a palindrome (35513031553).

The spelling of 21113000441 in words is "twenty-one billion, one hundred thirteen million, four hundred forty-one", and thus it is an aban number.