221201201000000 has 196 divisors, whose sum is σ = 590881496854404. Its totient is φ = 81674284800000.

The previous prime is 221201200999973. The next prime is 221201201000033. The reversal of 221201201000000 is 102102122.

It is a happy number.

It can be written as a sum of positive squares in 14 ways, for example, as 82333265717824 + 138867935282176 = 9073768^2 + 11784224^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4492262 + ... + 21507738.

Almost surely, 2^{221201201000000} is an apocalyptic number.

221201201000000 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 221201201000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295440748427202).

221201201000000 is an abundant number, since it is smaller than the sum of its proper divisors (369680295854404).

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

221201201000000 is an frugal number, since it uses more digits than its factorization.

221201201000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17015532 (or 17015497 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221201201000000 its reverse (102102122), we get a palindrome (221201303102122).

The spelling of 221201201000000 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred one million", and thus it is an aban number.