1200021077 has 2 divisors, whose sum is σ = 1200021078. Its totient is φ = 1200021076.

The previous prime is 1200021013. The next prime is 1200021079. The reversal of 1200021077 is 7701200021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1114624996 + 85396081 = 33386^2 + 9241^2 .

It is an emirp because it is prime and its reverse (7701200021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200021077 - 2⁶ = 1200021013 is a prime.

Together with 1200021079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200021079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010538 + 600010539.

It is an arithmetic number, because the mean of its divisors is an integer number (600010539).

Almost surely, 2^1200021077 is an apocalyptic number.

It is an amenable number.

1200021077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200021077 is an equidigital number, since it uses as much as digits as its factorization.

1200021077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 1200021077 is about 34641.3203703323. The cubic root of 1200021077 is about 1062.6647907169.

Adding to 1200021077 its reverse (7701200021), we get a palindrome (8901221098).

The spelling of 1200021077 in words is "one billion, two hundred million, twenty-one thousand, seventy-seven".