21577073 has 8 divisors (see below), whose sum is σ = 25510080. Its totient is φ = 17856720.

The previous prime is 21577069. The next prime is 21577091. The reversal of 21577073 is 37077512.

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

It is not a de Polignac number, because 21577073 - 2² = 21577069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21577093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52943 + ... + 53348.

It is an arithmetic number, because the mean of its divisors is an integer number (3188760).

Almost surely, 2^21577073 is an apocalyptic number.

It is an amenable number.

21577073 is a deficient number, since it is larger than the sum of its proper divisors (3933007).

21577073 is a wasteful number, since it uses less digits than its factorization.

21577073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106327.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 21577073 is about 4645.1128081027. The cubic root of 21577073 is about 278.3967602193.

The spelling of 21577073 in words is "twenty-one million, five hundred seventy-seven thousand, seventy-three".