221020121122200 has 288 divisors, whose sum is σ = 781344989380800. Its totient is φ = 55835270542080.

The previous prime is 221020121122153. The next prime is 221020121122223. The reversal of 221020121122200 is 2221121020122.

It is a happy number.

221020121122200 is a `hidden beast` number, since 2 + 210 + 20 + 1 + 211 + 2 + 220 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 2589136719 + ... + 2589222081.

It is an arithmetic number, because the mean of its divisors is an integer number (2713003435350).

Almost surely, 2^{221020121122200} is an apocalyptic number.

221020121122200 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 221020121122200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390672494690400).

221020121122200 is an abundant number, since it is smaller than the sum of its proper divisors (560324868258600).

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

221020121122200 is a wasteful number, since it uses less digits than its factorization.

221020121122200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161111 (or 161099 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221020121122200 its reverse (2221121020122), we get a palindrome (223241242142322).

The spelling of 221020121122200 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred".