21107677445 has 16 divisors (see below), whose sum is σ = 27325194480. Its totient is φ = 15592971264.

The previous prime is 21107677321. The next prime is 21107677457. The reversal of 21107677445 is 54477670112.

It can be written as a sum of positive squares in 8 ways, for example, as 2603244484 + 18504432961 = 51022^2 + 136031^2 .

It is a cyclic number.

It is not a de Polignac number, because 21107677445 - 2¹⁶ = 21107611909 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21107677396 and 21107677405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2338190 + ... + 2347199.

It is an arithmetic number, because the mean of its divisors is an integer number (1707824655).

Almost surely, 2^21107677445 is an apocalyptic number.

It is an amenable number.

21107677445 is a deficient number, since it is larger than the sum of its proper divisors (6217517035).

21107677445 is a wasteful number, since it uses less digits than its factorization.

21107677445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685464.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 21107677445 in words is "twenty-one billion, one hundred seven million, six hundred seventy-seven thousand, four hundred forty-five".