20012113121 has 32 divisors (see below), whose sum is σ = 26896859136. Its totient is φ = 14379624000.

The previous prime is 20012113103. The next prime is 20012113123. The reversal of 20012113121 is 12131121002.

It is not a de Polignac number, because 20012113121 - 2¹⁰ = 20012112097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012113096 and 20012113105.

It is not an unprimeable number, because it can be changed into a prime (20012113123) 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, 1022336 + ... + 1041726.

It is an arithmetic number, because the mean of its divisors is an integer number (840526848).

Almost surely, 2^20012113121 is an apocalyptic number.

It is an amenable number.

20012113121 is a deficient number, since it is larger than the sum of its proper divisors (6884746015).

20012113121 is a wasteful number, since it uses less digits than its factorization.

20012113121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20453.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20012113121 its reverse (12131121002), we get a palindrome (32143234123).

The spelling of 20012113121 in words is "twenty billion, twelve million, one hundred thirteen thousand, one hundred twenty-one".