2020121261 has 2 divisors, whose sum is σ = 2020121262. Its totient is φ = 2020121260.

The previous prime is 2020121183. The next prime is 2020121267. The reversal of 2020121261 is 1621210202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1330060900 + 690060361 = 36470^2 + 26269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2020121261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020121267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010060630 + 1010060631.

It is an arithmetic number, because the mean of its divisors is an integer number (1010060631).

Almost surely, 2^2020121261 is an apocalyptic number.

It is an amenable number.

2020121261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020121261 is an equidigital number, since it uses as much as digits as its factorization.

2020121261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2020121261 is about 44945.7590991631. The cubic root of 2020121261 is about 1264.1321592189.

Adding to 2020121261 its reverse (1621210202), we get a palindrome (3641331463).

The spelling of 2020121261 in words is "two billion, twenty million, one hundred twenty-one thousand, two hundred sixty-one".