20121010120121 has 4 divisors (see below), whose sum is σ = 20121781568592. Its totient is φ = 20120238671652.

The previous prime is 20121010120091. The next prime is 20121010120129. The reversal of 20121010120121 is 12102101012102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121010120121 - 2²² = 20121005925817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121010120096 and 20121010120105.

It is not an unprimeable number, because it can be changed into a prime (20121010120129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385685111 + ... + 385737276.

It is an arithmetic number, because the mean of its divisors is an integer number (5030445392148).

Almost surely, 2^{20121010120121} is an apocalyptic number.

It is an amenable number.

20121010120121 is a deficient number, since it is larger than the sum of its proper divisors (771448471).

20121010120121 is an equidigital number, since it uses as much as digits as its factorization.

20121010120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771448470.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20121010120121 its reverse (12102101012102), we get a palindrome (32223111132223).

The spelling of 20121010120121 in words is "twenty trillion, one hundred twenty-one billion, ten million, one hundred twenty thousand, one hundred twenty-one".