20001201113121 has 16 divisors (see below), whose sum is σ = 26728481678400. Its totient is φ = 13304029132800.

The previous prime is 20001201113111. The next prime is 20001201113137. The reversal of 20001201113121 is 12131110210002.

It is not a de Polignac number, because 20001201113121 - 2⁹ = 20001201112609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20001201113121.

It is not an unprimeable number, because it can be changed into a prime (20001201113111) 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, 47475426 + ... + 47894868.

It is an arithmetic number, because the mean of its divisors is an integer number (1670530104900).

Almost surely, 2^{20001201113121} is an apocalyptic number.

It is an amenable number.

20001201113121 is a deficient number, since it is larger than the sum of its proper divisors (6727280565279).

20001201113121 is a wasteful number, since it uses less digits than its factorization.

20001201113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455296.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20001201113121 its reverse (12131110210002), we get a palindrome (32132311323123).

The spelling of 20001201113121 in words is "twenty trillion, one billion, two hundred one million, one hundred thirteen thousand, one hundred twenty-one".