21577603548 has 48 divisors (see below), whose sum is σ = 52746253056. Its totient is φ = 6852384000.

The previous prime is 21577603529. The next prime is 21577603577. The reversal of 21577603548 is 84530677512.

It is a junction number, because it is equal to n+sod(n) for n = 21577603497 and 21577603506.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 86461 + ... + 225012.

It is an arithmetic number, because the mean of its divisors is an integer number (1098880272).

Almost surely, 2^21577603548 is an apocalyptic number.

It is an amenable number.

21577603548 is an abundant number, since it is smaller than the sum of its proper divisors (31168649508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21577603548 is a wasteful number, since it uses less digits than its factorization.

21577603548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311754 (or 311752 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 21577603548 in words is "twenty-one billion, five hundred seventy-seven million, six hundred three thousand, five hundred forty-eight".