20012001012121 has 16 divisors (see below), whose sum is σ = 21277572096384. Its totient is φ = 18779437266304.

The previous prime is 20012001012079. The next prime is 20012001012139. The reversal of 20012001012121 is 12121010021002.

It is a de Polignac number, because none of the positive numbers 2^k-20012001012121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012001012161) 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, 17155950 + ... + 18285256.

It is an arithmetic number, because the mean of its divisors is an integer number (1329848256024).

Almost surely, 2^{20012001012121} is an apocalyptic number.

It is an amenable number.

20012001012121 is a deficient number, since it is larger than the sum of its proper divisors (1265571084263).

20012001012121 is a wasteful number, since it uses less digits than its factorization.

20012001012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143920.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20012001012121 its reverse (12121010021002), we get a palindrome (32133011033123).

The spelling of 20012001012121 in words is "twenty trillion, twelve billion, one million, twelve thousand, one hundred twenty-one".