2121002077 has 2 divisors, whose sum is σ = 2121002078. Its totient is φ = 2121002076.

The previous prime is 2121002069. The next prime is 2121002101. The reversal of 2121002077 is 7702001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2035272996 + 85729081 = 45114^2 + 9259^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121002077 - 2³ = 2121002069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121002027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060501038 + 1060501039.

It is an arithmetic number, because the mean of its divisors is an integer number (1060501039).

Almost surely, 2^2121002077 is an apocalyptic number.

It is an amenable number.

2121002077 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121002077 is an equidigital number, since it uses as much as digits as its factorization.

2121002077 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 22.

The square root of 2121002077 is about 46054.3383081334. The cubic root of 2121002077 is about 1284.8340314648.

Adding to 2121002077 its reverse (7702001212), we get a palindrome (9823003289).

The spelling of 2121002077 in words is "two billion, one hundred twenty-one million, two thousand, seventy-seven".