21195603056 has 40 divisors (see below), whose sum is σ = 42903280800. Its totient is φ = 10131027200.

The previous prime is 21195603053. The next prime is 21195603097. The reversal of 21195603056 is 65030659112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21195603053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179276 + ... + 273003.

It is an arithmetic number, because the mean of its divisors is an integer number (1072582020).

Almost surely, 2^21195603056 is an apocalyptic number.

It is an amenable number.

21195603056 is an abundant number, since it is smaller than the sum of its proper divisors (21707677744).

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

21195603056 is a wasteful number, since it uses less digits than its factorization.

21195603056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452417 (or 452411 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The spelling of 21195603056 in words is "twenty-one billion, one hundred ninety-five million, six hundred three thousand, fifty-six".