2001201311221 has 16 divisors (see below), whose sum is σ = 2308307998464. Its totient is φ = 1699412730624.

The previous prime is 2001201311183. The next prime is 2001201311233. The reversal of 2001201311221 is 1221131021002.

It is not a de Polignac number, because 2001201311221 - 2⁹ = 2001201310709 is a prime.

It is a super-4 number, since 4×2001201311221⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001201311195 and 2001201311204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001201321221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1327696 + ... + 2401078.

It is an arithmetic number, because the mean of its divisors is an integer number (144269249904).

Almost surely, 2^{2001201311221} is an apocalyptic number.

It is an amenable number.

2001201311221 is a deficient number, since it is larger than the sum of its proper divisors (307106687243).

2001201311221 is a wasteful number, since it uses less digits than its factorization.

2001201311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075860.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2001201311221 its reverse (1221131021002), we get a palindrome (3222332332223).

The spelling of 2001201311221 in words is "two trillion, one billion, two hundred one million, three hundred eleven thousand, two hundred twenty-one".