21574706045 has 4 divisors (see below), whose sum is σ = 25889647260. Its totient is φ = 17259764832.

The previous prime is 21574706039. The next prime is 21574706057. The reversal of 21574706045 is 54060747512.

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 4162056196 + 17412649849 = 64514^2 + 131957^2 .

It is a cyclic number.

It is not a de Polignac number, because 21574706045 - 2¹⁸ = 21574443901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21574705993 and 21574706011.

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, 2157470600 + ... + 2157470609.

It is an arithmetic number, because the mean of its divisors is an integer number (6472411815).

Almost surely, 2^21574706045 is an apocalyptic number.

It is an amenable number.

21574706045 is a deficient number, since it is larger than the sum of its proper divisors (4314941215).

21574706045 is an equidigital number, since it uses as much as digits as its factorization.

21574706045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314941214.

The product of its (nonzero) digits is 235200, while the sum is 41.

The spelling of 21574706045 in words is "twenty-one billion, five hundred seventy-four million, seven hundred six thousand, forty-five".