20012001122121 has 16 divisors (see below), whose sum is σ = 26689999897344. Its totient is φ = 13337668738944.

The previous prime is 20012001122117. The next prime is 20012001122137. The reversal of 20012001122121 is 12122110021002.

It is not a de Polignac number, because 20012001122121 - 2² = 20012001122117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012001122121.

It is not an unprimeable number, because it can be changed into a prime (20012001122101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172642435 + ... + 172758311.

It is an arithmetic number, because the mean of its divisors is an integer number (1668124993584).

Almost surely, 2^{20012001122121} is an apocalyptic number.

It is an amenable number.

20012001122121 is a deficient number, since it is larger than the sum of its proper divisors (6677998775223).

20012001122121 is a wasteful number, since it uses less digits than its factorization.

20012001122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131200.

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

Adding to 20012001122121 its reverse (12122110021002), we get a palindrome (32134111143123).

The spelling of 20012001122121 in words is "twenty trillion, twelve billion, one million, one hundred twenty-two thousand, one hundred twenty-one".