120021021977 has 2 divisors, whose sum is σ = 120021021978. Its totient is φ = 120021021976.

The previous prime is 120021021973. The next prime is 120021022031. The reversal of 120021021977 is 779120120021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110040812176 + 9980209801 = 331724^2 + 99901^2 .

It is a cyclic number.

It is not a de Polignac number, because 120021021977 - 2² = 120021021973 is a prime.

It is a super-4 number, since 4×120021021977⁴ (a number of 45 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (120021021973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60010510988 + 60010510989.

It is an arithmetic number, because the mean of its divisors is an integer number (60010510989).

Almost surely, 2^120021021977 is an apocalyptic number.

It is an amenable number.

120021021977 is a deficient number, since it is larger than the sum of its proper divisors (1).

120021021977 is an equidigital number, since it uses as much as digits as its factorization.

120021021977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 32.

Adding to 120021021977 its reverse (779120120021), we get a palindrome (899141141998).

The spelling of 120021021977 in words is "one hundred twenty billion, twenty-one million, twenty-one thousand, nine hundred seventy-seven".