2001221101222 has 16 divisors (see below), whose sum is σ = 3462727034880. Its totient is φ = 849650613768.

The previous prime is 2001221101213. The next prime is 2001221101223. The reversal of 2001221101222 is 2221011221002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2001221101196 and 2001221101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001221101223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667962822 + ... + 667965817.

It is an arithmetic number, because the mean of its divisors is an integer number (216420439680).

Almost surely, 2^{2001221101222} is an apocalyptic number.

2001221101222 is a deficient number, since it is larger than the sum of its proper divisors (1461505933658).

2001221101222 is a wasteful number, since it uses less digits than its factorization.

2001221101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335928755.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2001221101222 its reverse (2221011221002), we get a palindrome (4222232322224).

The spelling of 2001221101222 in words is "two trillion, one billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty-two".