21112445413 has 32 divisors (see below), whose sum is σ = 22312854144. Its totient is φ = 19958400000.

The previous prime is 21112445383. The next prime is 21112445423. The reversal of 21112445413 is 31454421112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112445413 is a prime.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112445423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63783658 + ... + 63783988.

It is an arithmetic number, because the mean of its divisors is an integer number (697276692).

Almost surely, 2^21112445413 is an apocalyptic number.

It is an amenable number.

21112445413 is a deficient number, since it is larger than the sum of its proper divisors (1200408731).

21112445413 is a wasteful number, since it uses less digits than its factorization.

21112445413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its digits is 3840, while the sum is 28.

Adding to 21112445413 its reverse (31454421112), we get a palindrome (52566866525).

The spelling of 21112445413 in words is "twenty-one billion, one hundred twelve million, four hundred forty-five thousand, four hundred thirteen".