21056584948 has 24 divisors (see below), whose sum is σ = 44590416192. Its totient is φ = 8493412224.

The previous prime is 21056584943. The next prime is 21056584981. The reversal of 21056584948 is 84948565012.

It is a junction number, because it is equal to n+sod(n) for n = 21056584895 and 21056584904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056584943) 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, 22117786 + ... + 22118737.

It is an arithmetic number, because the mean of its divisors is an integer number (1857934008).

Almost surely, 2^21056584948 is an apocalyptic number.

21056584948 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21056584948 is an abundant number, since it is smaller than the sum of its proper divisors (23533831244).

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

21056584948 is a wasteful number, since it uses less digits than its factorization.

21056584948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44236551 (or 44236549 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 21056584948 in words is "twenty-one billion, fifty-six million, five hundred eighty-four thousand, nine hundred forty-eight".