21077344445 has 4 divisors (see below), whose sum is σ = 25292813340. Its totient is φ = 16861875552.

The previous prime is 21077344403. The next prime is 21077344523. The reversal of 21077344445 is 54444377012.

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 14512779961 + 6564564484 = 120469^2 + 81022^2 .

It is a cyclic number.

It is not a de Polignac number, because 21077344445 - 2³⁰ = 20003602621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2107734440 + ... + 2107734449.

It is an arithmetic number, because the mean of its divisors is an integer number (6323203335).

Almost surely, 2^21077344445 is an apocalyptic number.

It is an amenable number.

21077344445 is a deficient number, since it is larger than the sum of its proper divisors (4215468895).

21077344445 is an equidigital number, since it uses as much as digits as its factorization.

21077344445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215468894.

The product of its (nonzero) digits is 376320, while the sum is 41.

The spelling of 21077344445 in words is "twenty-one billion, seventy-seven million, three hundred forty-four thousand, four hundred forty-five".