21546799104 has 104 divisors (see below), whose sum is σ = 57981795520. Its totient is φ = 7115931648.

The previous prime is 21546799097. The next prime is 21546799111. The reversal of 21546799104 is 40199764512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21546799097) and next prime (21546799111).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1331349 + ... + 1347435.

Almost surely, 2^21546799104 is an apocalyptic number.

21546799104 is a gapful number since it is divisible by the number (24) 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 21546799104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28990897760).

21546799104 is an abundant number, since it is smaller than the sum of its proper divisors (36434996416).

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

21546799104 is a wasteful number, since it uses less digits than its factorization.

21546799104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16223 (or 16201 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 21546799104 in words is "twenty-one billion, five hundred forty-six million, seven hundred ninety-nine thousand, one hundred four".