2001222211001 has 4 divisors (see below), whose sum is σ = 2155162381092. Its totient is φ = 1847282040912.

The previous prime is 2001222210947. The next prime is 2001222211003. The reversal of 2001222211001 is 1001122221002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124661955625 + 1876560255376 = 353075^2 + 1369876^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001222211001 - 2¹⁸ = 2001221948857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001222211003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76970085026 + ... + 76970085051.

It is an arithmetic number, because the mean of its divisors is an integer number (538790595273).

Almost surely, 2^{2001222211001} is an apocalyptic number.

It is an amenable number.

2001222211001 is a deficient number, since it is larger than the sum of its proper divisors (153940170091).

2001222211001 is a wasteful number, since it uses less digits than its factorization.

2001222211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153940170090.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001222211001 its reverse (1001122221002), we get a palindrome (3002344432003).

The spelling of 2001222211001 in words is "two trillion, one billion, two hundred twenty-two million, two hundred eleven thousand, one".