2001210221121 has 8 divisors (see below), whose sum is σ = 2740395978624. Its totient is φ = 1298082305520.

The previous prime is 2001210221107. The next prime is 2001210221137. The reversal of 2001210221121 is 1211220121002.

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

It is not a de Polignac number, because 2001210221121 - 2⁵ = 2001210221089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001210221121.

It is not an unprimeable number, because it can be changed into a prime (2001210221221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9014460345 + ... + 9014460566.

It is an arithmetic number, because the mean of its divisors is an integer number (342549497328).

Almost surely, 2^{2001210221121} is an apocalyptic number.

It is an amenable number.

2001210221121 is a deficient number, since it is larger than the sum of its proper divisors (739185757503).

2001210221121 is a wasteful number, since it uses less digits than its factorization.

2001210221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18028920951.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001210221121 its reverse (1211220121002), we get a palindrome (3212430342123).

The spelling of 2001210221121 in words is "two trillion, one billion, two hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".