221210201201220 has 384 divisors, whose sum is σ = 858138140160000. Its totient is φ = 45959826124800.

The previous prime is 221210201201219. The next prime is 221210201201237. The reversal of 221210201201220 is 22102102012122.

It is a happy number.

221210201201220 is a `hidden beast` number, since 2 + 21 + 21 + 0 + 201 + 201 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 221210201201193 and 221210201201202.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 325689531 + ... + 326368029.

It is an arithmetic number, because the mean of its divisors is an integer number (2234734740000).

Almost surely, 2^{221210201201220} is an apocalyptic number.

221210201201220 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 221210201201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (429069070080000).

221210201201220 is an abundant number, since it is smaller than the sum of its proper divisors (636927938958780).

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

221210201201220 is a wasteful number, since it uses less digits than its factorization.

221210201201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686376 (or 686368 counting only the distinct ones).

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

Adding to 221210201201220 its reverse (22102102012122), we get a palindrome (243312303213342).

The spelling of 221210201201220 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred one million, two hundred one thousand, two hundred twenty".