21592045 has 4 divisors (see below), whose sum is σ = 25910460. Its totient is φ = 17273632.

The previous prime is 21592019. The next prime is 21592073. The reversal of 21592045 is 54029512.

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 6953769 + 14638276 = 2637^2 + 3826^2 .

It is a cyclic number.

It is not a de Polignac number, because 21592045 - 2⁹ = 21591533 is a prime.

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, 2159200 + ... + 2159209.

It is an arithmetic number, because the mean of its divisors is an integer number (6477615).

Almost surely, 2^21592045 is an apocalyptic number.

It is an amenable number.

21592045 is a deficient number, since it is larger than the sum of its proper divisors (4318415).

21592045 is an equidigital number, since it uses as much as digits as its factorization.

21592045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318414.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 21592045 is about 4646.7241149007. The cubic root of 21592045 is about 278.4611370788.

The spelling of 21592045 in words is "twenty-one million, five hundred ninety-two thousand, forty-five".