20121020121 has 32 divisors (see below), whose sum is σ = 28603313280. Its totient is φ = 12545280000.

The previous prime is 20121020069. The next prime is 20121020147. The reversal of 20121020121 is 12102012102.

It is not a de Polignac number, because 20121020121 - 2¹⁴ = 20121003737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121020097 and 20121020106.

It is not an unprimeable number, because it can be changed into a prime (20121720121) 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, 2027271 + ... + 2037171.

It is an arithmetic number, because the mean of its divisors is an integer number (893853540).

Almost surely, 2^20121020121 is an apocalyptic number.

It is an amenable number.

20121020121 is a deficient number, since it is larger than the sum of its proper divisors (8482293159).

20121020121 is a wasteful number, since it uses less digits than its factorization.

20121020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10377.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20121020121 its reverse (12102012102), we get a palindrome (32223032223).

The spelling of 20121020121 in words is "twenty billion, one hundred twenty-one million, twenty thousand, one hundred twenty-one".