20121010121 has 8 divisors (see below), whose sum is σ = 21017572224. Its totient is φ = 19226259360.

The previous prime is 20121010109. The next prime is 20121010157. The reversal of 20121010121 is 12101012102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20121010121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121010321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430100 + ... + 474581.

It is an arithmetic number, because the mean of its divisors is an integer number (2627196528).

Almost surely, 2^20121010121 is an apocalyptic number.

It is an amenable number.

20121010121 is a deficient number, since it is larger than the sum of its proper divisors (896562103).

20121010121 is an equidigital number, since it uses as much as digits as its factorization.

20121010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905671.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20121010121 its reverse (12101012102), we get a palindrome (32222022223).

The spelling of 20121010121 in words is "twenty billion, one hundred twenty-one million, ten thousand, one hundred twenty-one".