21574045 has 8 divisors (see below), whose sum is σ = 26180280. Its totient is φ = 17064960.

The previous prime is 21574027. The next prime is 21574087. The reversal of 21574045 is 54047512.

It can be written as a sum of positive squares in 4 ways, for example, as 5098564 + 16475481 = 2258^2 + 4059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21574045 - 2⁵ = 21574013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23796 + ... + 24685.

It is an arithmetic number, because the mean of its divisors is an integer number (3272535).

Almost surely, 2^21574045 is an apocalyptic number.

It is an amenable number.

21574045 is a deficient number, since it is larger than the sum of its proper divisors (4606235).

21574045 is an equidigital number, since it uses as much as digits as its factorization.

21574045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48575.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 21574045 is about 4644.7868627096. The cubic root of 21574045 is about 278.3837367534.

The spelling of 21574045 in words is "twenty-one million, five hundred seventy-four thousand, forty-five".