21112534445 has 4 divisors (see below), whose sum is σ = 25335041340. Its totient is φ = 16890027552.

The previous prime is 21112534427. The next prime is 21112534507. The reversal of 21112534445 is 54443521112.

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 12396818281 + 8715716164 = 111341^2 + 93358^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112534445 - 2¹² = 21112530349 is a prime.

It is a super-2 number, since 2×21112534445² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2111253440 + ... + 2111253449.

It is an arithmetic number, because the mean of its divisors is an integer number (6333760335).

Almost surely, 2^21112534445 is an apocalyptic number.

It is an amenable number.

21112534445 is a deficient number, since it is larger than the sum of its proper divisors (4222506895).

21112534445 is an equidigital number, since it uses as much as digits as its factorization.

21112534445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222506894.

The product of its digits is 19200, while the sum is 32.

The spelling of 21112534445 in words is "twenty-one billion, one hundred twelve million, five hundred thirty-four thousand, four hundred forty-five".