21544430504010 has 256 divisors, whose sum is σ = 54375599116800. Its totient is φ = 5456200974336.

The previous prime is 21544430503979. The next prime is 21544430504041. The reversal of 21544430504010 is 1040503444512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21544430503979) and next prime (21544430504041).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5716217406 + ... + 5716221174.

It is an arithmetic number, because the mean of its divisors is an integer number (212404684050).

Almost surely, 2^{21544430504010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21544430504010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27187799558400).

21544430504010 is an abundant number, since it is smaller than the sum of its proper divisors (32831168612790).

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

21544430504010 is a wasteful number, since it uses less digits than its factorization.

21544430504010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4377.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 21544430504010 its reverse (1040503444512), we get a palindrome (22584933948522).

The spelling of 21544430504010 in words is "twenty-one trillion, five hundred forty-four billion, four hundred thirty million, five hundred four thousand, ten".