21577796 has 12 divisors (see below), whose sum is σ = 38050320. Its totient is φ = 10706280.

The previous prime is 21577793. The next prime is 21577817. The reversal of 21577796 is 69777512.

It is not an unprimeable number, because it can be changed into a prime (21577793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20066 + ... + 21113.

It is an arithmetic number, because the mean of its divisors is an integer number (3170860).

Almost surely, 2^21577796 is an apocalyptic number.

It is an amenable number.

21577796 is a deficient number, since it is larger than the sum of its proper divisors (16472524).

21577796 is a wasteful number, since it uses less digits than its factorization.

21577796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41314 (or 41312 counting only the distinct ones).

The product of its digits is 185220, while the sum is 44.

The square root of 21577796 is about 4645.1906311797. The cubic root of 21577796 is about 278.3998696712.

The spelling of 21577796 in words is "twenty-one million, five hundred seventy-seven thousand, seven hundred ninety-six".