21773432056 has 64 divisors (see below), whose sum is σ = 43158528000. Its totient is φ = 10284468480.

The previous prime is 21773432041. The next prime is 21773432077. The reversal of 21773432056 is 65023437712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1737445 + ... + 1749931.

It is an arithmetic number, because the mean of its divisors is an integer number (674352000).

Almost surely, 2^21773432056 is an apocalyptic number.

It is an amenable number.

21773432056 is a deficient number, since it is larger than the sum of its proper divisors (21385095944).

21773432056 is a wasteful number, since it uses less digits than its factorization.

21773432056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12692 (or 12688 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 40.

Adding to 21773432056 its reverse (65023437712), we get a palindrome (86796869768).

The spelling of 21773432056 in words is "twenty-one billion, seven hundred seventy-three million, four hundred thirty-two thousand, fifty-six".