2221221201210 has 144 divisors (see below), whose sum is σ = 6383388604320. Its totient is φ = 535469140800.

The previous prime is 2221221201193. The next prime is 2221221201211. The reversal of 2221221201210 is 121021221222.

It is a happy number.

2221221201210 is a `hidden beast` number, since 2 + 221 + 221 + 201 + 21 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (2221221201211) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1379565 + ... + 2519055.

It is an arithmetic number, because the mean of its divisors is an integer number (44329087530).

Almost surely, 2^{2221221201210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221221201210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3191694302160).

2221221201210 is an abundant number, since it is smaller than the sum of its proper divisors (4162167403110).

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

2221221201210 is a wasteful number, since it uses less digits than its factorization.

2221221201210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139705 (or 1139691 counting only the distinct ones).

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

Adding to 2221221201210 its reverse (121021221222), we get a palindrome (2342242422432).

The spelling of 2221221201210 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, two hundred ten".