20200123121 has 2 divisors, whose sum is σ = 20200123122. Its totient is φ = 20200123120.

The previous prime is 20200123081. The next prime is 20200123133. The reversal of 20200123121 is 12132100202.

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., 15709112896 + 4491010225 = 125336^2 + 67015^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200123121 - 2⁶ = 20200123057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20200123096 and 20200123105.

It is not a weakly prime, because it can be changed into another prime (20200120121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100061560 + 10100061561.

It is an arithmetic number, because the mean of its divisors is an integer number (10100061561).

Almost surely, 2^20200123121 is an apocalyptic number.

It is an amenable number.

20200123121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200123121 is an equidigital number, since it uses as much as digits as its factorization.

20200123121 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 20200123121 its reverse (12132100202), we get a palindrome (32332223323).

The spelling of 20200123121 in words is "twenty billion, two hundred million, one hundred twenty-three thousand, one hundred twenty-one".