221020220220100 has 144 divisors (see below), whose sum is σ = 556608149798400. Its totient is φ = 74613412177920.

The previous prime is 221020220220083. The next prime is 221020220220109. The reversal of 221020220220100 is 1022022020122.

It is a super-2 number, since 2×221020220220100² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221020220220109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7467784 + ... + 22311616.

It is an arithmetic number, because the mean of its divisors is an integer number (3865334373600).

Almost surely, 2^{221020220220100} is an apocalyptic number.

221020220220100 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 221020220220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278304074899200).

221020220220100 is an abundant number, since it is smaller than the sum of its proper divisors (335587929578300).

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

221020220220100 is a wasteful number, since it uses less digits than its factorization.

221020220220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14844182 (or 14844175 counting only the distinct ones).

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

Adding to 221020220220100 its reverse (1022022020122), we get a palindrome (222042242240222).

The spelling of 221020220220100 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty million, two hundred twenty thousand, one hundred".