21148333920 has 288 divisors, whose sum is σ = 85140357120. Its totient is φ = 4677903360.

The previous prime is 21148333907. The next prime is 21148333949. The reversal of 21148333920 is 2933384112.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 278641 + ... + 346319.

It is an arithmetic number, because the mean of its divisors is an integer number (295626240).

Almost surely, 2^21148333920 is an apocalyptic number.

21148333920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21148333920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42570178560).

21148333920 is an abundant number, since it is smaller than the sum of its proper divisors (63992023200).

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

21148333920 is a wasteful number, since it uses less digits than its factorization.

21148333920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67738 (or 67727 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 21148333920 in words is "twenty-one billion, one hundred forty-eight million, three hundred thirty-three thousand, nine hundred twenty".