21148469981808 has 120 divisors (see below), whose sum is σ = 59175395210880. Its totient is φ = 6505462529280.

The previous prime is 21148469981801. The next prime is 21148469981809. The reversal of 21148469981808 is 80818996484112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148469981801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29818023 + ... + 30519033.

It is an arithmetic number, because the mean of its divisors is an integer number (493128293424).

Almost surely, 2^{21148469981808} 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 21148469981808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29587697605440).

21148469981808 is an abundant number, since it is smaller than the sum of its proper divisors (38026925229072).

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

21148469981808 is a wasteful number, since it uses less digits than its factorization.

21148469981808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704767 (or 704748 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 69.

The spelling of 21148469981808 in words is "twenty-one trillion, one hundred forty-eight billion, four hundred sixty-nine million, nine hundred eighty-one thousand, eight hundred eight".