2001221200121 has 32 divisors (see below), whose sum is σ = 2378089663488. Its totient is φ = 1660097802240.

The previous prime is 2001221200103. The next prime is 2001221200171. The reversal of 2001221200121 is 1210021221002.

It is a cyclic number.

It is not a de Polignac number, because 2001221200121 - 2²⁶ = 2001154091257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001221200096 and 2001221200105.

It is not an unprimeable number, because it can be changed into a prime (2001221200171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11887085 + ... + 12054261.

It is an arithmetic number, because the mean of its divisors is an integer number (74315301984).

Almost surely, 2^{2001221200121} is an apocalyptic number.

It is an amenable number.

2001221200121 is a deficient number, since it is larger than the sum of its proper divisors (376868463367).

2001221200121 is a wasteful number, since it uses less digits than its factorization.

2001221200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168161.

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

Adding to 2001221200121 its reverse (1210021221002), we get a palindrome (3211242421123).

It can be divided in two parts, 2001 and 221200121, that added together give a palindrome (221202122).

The spelling of 2001221200121 in words is "two trillion, one billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-one".