20011313121 has 32 divisors (see below), whose sum is σ = 27305346432. Its totient is φ = 13033198080.

The previous prime is 20011313117. The next prime is 20011313219. The reversal of 20011313121 is 12131311002.

It is a happy number.

It is not a de Polignac number, because 20011313121 - 2² = 20011313117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20011313121.

It is not an unprimeable number, because it can be changed into a prime (20011313111) 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, 11613366 + ... + 11615088.

It is an arithmetic number, because the mean of its divisors is an integer number (853292076).

Almost surely, 2^20011313121 is an apocalyptic number.

It is an amenable number.

20011313121 is a deficient number, since it is larger than the sum of its proper divisors (7294033311).

20011313121 is a wasteful number, since it uses less digits than its factorization.

20011313121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20011313121 its reverse (12131311002), we get a palindrome (32142624123).

The spelling of 20011313121 in words is "twenty billion, eleven million, three hundred thirteen thousand, one hundred twenty-one".