21420754848 has 72 divisors (see below), whose sum is σ = 60991047936. Its totient is φ = 7131369600.

The previous prime is 21420754843. The next prime is 21420754867. The reversal of 21420754848 is 84845702412.

21420754848 is a `hidden beast` number, since 21 + 42 + 0 + 7 + 548 + 48 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21420754843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187713 + ... + 279423.

It is an arithmetic number, because the mean of its divisors is an integer number (847097888).

Almost surely, 2^21420754848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21420754848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30495523968).

21420754848 is an abundant number, since it is smaller than the sum of its proper divisors (39570293088).

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

21420754848 is a wasteful number, since it uses less digits than its factorization.

21420754848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92538 (or 92527 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 45.

The spelling of 21420754848 in words is "twenty-one billion, four hundred twenty million, seven hundred fifty-four thousand, eight hundred forty-eight".