20201230121 has 2 divisors, whose sum is σ = 20201230122. Its totient is φ = 20201230120.

The previous prime is 20201230109. The next prime is 20201230123. The reversal of 20201230121 is 12103210202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19702333225 + 498896896 = 140365^2 + 22336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201230121 is a prime.

It is a Sophie Germain prime.

Together with 20201230123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20201230096 and 20201230105.

It is not a weakly prime, because it can be changed into another prime (20201230123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100615060 + 10100615061.

It is an arithmetic number, because the mean of its divisors is an integer number (10100615061).

Almost surely, 2^20201230121 is an apocalyptic number.

It is an amenable number.

20201230121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201230121 is an equidigital number, since it uses as much as digits as its factorization.

20201230121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20201230121 its reverse (12103210202), we get a palindrome (32304440323).

The spelling of 20201230121 in words is "twenty billion, two hundred one million, two hundred thirty thousand, one hundred twenty-one".