2001210222221 has 8 divisors (see below), whose sum is σ = 2287221553344. Its totient is φ = 1715229930240.

The previous prime is 2001210222191. The next prime is 2001210222259. The reversal of 2001210222221 is 1222220121002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001210222221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001210222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001210221221) 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, 7621460 + ... + 7879661.

It is an arithmetic number, because the mean of its divisors is an integer number (285902694168).

Almost surely, 2^{2001210222221} is an apocalyptic number.

It is an amenable number.

2001210222221 is a deficient number, since it is larger than the sum of its proper divisors (286011331123).

2001210222221 is a wasteful number, since it uses less digits than its factorization.

2001210222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15519571.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2001210222221 its reverse (1222220121002), we get a palindrome (3223430343223).

The spelling of 2001210222221 in words is "two trillion, one billion, two hundred ten million, two hundred twenty-two thousand, two hundred twenty-one".