21220220220100 has 36 divisors (see below), whose sum is σ = 50234048596368. Its totient is φ = 7716443716000.

The previous prime is 21220220220091. The next prime is 21220220220167. The reversal of 21220220220100 is 102202202212.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9645553546 + ... + 9645555745.

It is an arithmetic number, because the mean of its divisors is an integer number (1395390238788).

Almost surely, 2^{21220220220100} is an apocalyptic number.

21220220220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220220220100 is an abundant number, since it is smaller than the sum of its proper divisors (29013828376268).

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

21220220220100 is a wasteful number, since it uses less digits than its factorization.

21220220220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19291109316 (or 19291109309 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21220220220100 its reverse (102202202212), we get a palindrome (21322422422312).

The spelling of 21220220220100 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty million, two hundred twenty thousand, one hundred".