221220121212200 has 192 divisors, whose sum is σ = 614586458145600. Its totient is φ = 73100950630400.

The previous prime is 221220121212193. The next prime is 221220121212317. The reversal of 221220121212200 is 2212121022122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100897754 + ... + 103066953.

It is an arithmetic number, because the mean of its divisors is an integer number (3200971136175).

Almost surely, 2^{221220121212200} is an apocalyptic number.

221220121212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220121212200 is an abundant number, since it is smaller than the sum of its proper divisors (393366336933400).

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

221220121212200 is a wasteful number, since it uses less digits than its factorization.

221220121212200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203964780 (or 203964771 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221220121212200 its reverse (2212121022122), we get a palindrome (223432242234322).

The spelling of 221220121212200 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twelve thousand, two hundred".