201221222000 has 80 divisors (see below), whose sum is σ = 489819096000. Its totient is φ = 79948179200.

The previous prime is 201221221997. The next prime is 201221222039. The reversal of 201221222000 is 222122102.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39620 + ... + 635619.

It is an arithmetic number, because the mean of its divisors is an integer number (6122738700).

Almost surely, 2^201221222000 is an apocalyptic number.

201221222000 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 201221222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244909548000).

201221222000 is an abundant number, since it is smaller than the sum of its proper divisors (288597874000).

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

201221222000 is a wasteful number, since it uses less digits than its factorization.

201221222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675411 (or 675395 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 201221222000 its reverse (222122102), we get a palindrome (201443344102).

The spelling of 201221222000 in words is "two hundred one billion, two hundred twenty-one million, two hundred twenty-two thousand".