21244402410 has 512 divisors, whose sum is σ = 71998046208. Its totient is φ = 3874590720.

The previous prime is 21244402373. The next prime is 21244402451. The reversal of 21244402410 is 1420444212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 38837757 + ... + 38838303.

It is an arithmetic number, because the mean of its divisors is an integer number (140621184).

Almost surely, 2^21244402410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21244402410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35999023104).

21244402410 is an abundant number, since it is smaller than the sum of its proper divisors (50753643798).

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

21244402410 is a wasteful number, since it uses less digits than its factorization.

21244402410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21244402410 its reverse (1420444212), we get a palindrome (22664846622).

The spelling of 21244402410 in words is "twenty-one billion, two hundred forty-four million, four hundred two thousand, four hundred ten".