21441401220 has 96 divisors (see below), whose sum is σ = 62205978240. Its totient is φ = 5514695680.

The previous prime is 21441401213. The next prime is 21441401309. The reversal of 21441401220 is 2210414412.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130480 + ... + 244760.

It is an arithmetic number, because the mean of its divisors is an integer number (647978940).

Almost surely, 2^21441401220 is an apocalyptic number.

21441401220 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 21441401220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31102989120).

21441401220 is an abundant number, since it is smaller than the sum of its proper divisors (40764577020).

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

21441401220 is a wasteful number, since it uses less digits than its factorization.

21441401220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114405 (or 114403 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21441401220 its reverse (2210414412), we get a palindrome (23651815632).

The spelling of 21441401220 in words is "twenty-one billion, four hundred forty-one million, four hundred one thousand, two hundred twenty".