20010120121 has 4 divisors (see below), whose sum is σ = 20042552052. Its totient is φ = 19977688192.

The previous prime is 20010120041. The next prime is 20010120131. The reversal of 20010120121 is 12102101002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 469155600 + 19540964521 = 21660^2 + 139789^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010120121 - 2⁷ = 20010119993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010120098 and 20010120107.

It is not an unprimeable number, because it can be changed into a prime (20010120131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16215040 + ... + 16216273.

It is an arithmetic number, because the mean of its divisors is an integer number (5010638013).

Almost surely, 2^20010120121 is an apocalyptic number.

It is an amenable number.

20010120121 is a deficient number, since it is larger than the sum of its proper divisors (32431931).

20010120121 is an equidigital number, since it uses as much as digits as its factorization.

20010120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32431930.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20010120121 its reverse (12102101002), we get a palindrome (32112221123).

The spelling of 20010120121 in words is "twenty billion, ten million, one hundred twenty thousand, one hundred twenty-one".