20000012121 has 12 divisors (see below), whose sum is σ = 28892865300. Its totient is φ = 13331514240.

The previous prime is 20000012063. The next prime is 20000012141. The reversal of 20000012121 is 12121000002.

It can be written as a sum of positive squares in 2 ways, for example, as 14324499225 + 5675512896 = 119685^2 + 75336^2 .

It is not a de Polignac number, because 20000012121 - 2¹³ = 20000003929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20000012141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81196 + ... + 215853.

It is an arithmetic number, because the mean of its divisors is an integer number (2407738775).

Almost surely, 2^20000012121 is an apocalyptic number.

It is an amenable number.

20000012121 is a deficient number, since it is larger than the sum of its proper divisors (8892853179).

20000012121 is a wasteful number, since it uses less digits than its factorization.

20000012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304536 (or 304533 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20000012121 its reverse (12121000002), we get a palindrome (32121012123).

The spelling of 20000012121 in words is "twenty billion, twelve thousand, one hundred twenty-one".