21444020202220 has 96 divisors (see below), whose sum is σ = 56155332280320. Its totient is φ = 6682542301440.

The previous prime is 21444020202203. The next prime is 21444020202247. The reversal of 21444020202220 is 2220202044412.

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, 6523162 + ... + 9243358.

It is an arithmetic number, because the mean of its divisors is an integer number (584951377920).

Almost surely, 2^{21444020202220} is an apocalyptic number.

21444020202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444020202220 is an abundant number, since it is smaller than the sum of its proper divisors (34711312078100).

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

21444020202220 is a wasteful number, since it uses less digits than its factorization.

21444020202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725343 (or 2725341 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 21444020202220 its reverse (2220202044412), we get a palindrome (23664222246632).

The spelling of 21444020202220 in words is "twenty-one trillion, four hundred forty-four billion, twenty million, two hundred two thousand, two hundred twenty".