2021121077 has 2 divisors, whose sum is σ = 2021121078. Its totient is φ = 2021121076.

The previous prime is 2021121061. The next prime is 2021121083. The reversal of 2021121077 is 7701211202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1461609361 + 559511716 = 38231^2 + 23654^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021121077 - 2⁴ = 2021121061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021121017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560538 + 1010560539.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560539).

Almost surely, 2^2021121077 is an apocalyptic number.

It is an amenable number.

2021121077 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021121077 is an equidigital number, since it uses as much as digits as its factorization.

2021121077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 2021121077 is about 44956.8801964727. The cubic root of 2021121077 is about 1264.3406765866.

Adding to 2021121077 its reverse (7701211202), we get a palindrome (9722332279).

The spelling of 2021121077 in words is "two billion, twenty-one million, one hundred twenty-one thousand, seventy-seven".