2100020977 has 2 divisors, whose sum is σ = 2100020978. Its totient is φ = 2100020976.

The previous prime is 2100020947. The next prime is 2100020981. The reversal of 2100020977 is 7790200012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1844788401 + 255232576 = 42951^2 + 15976^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100020977 - 2²³ = 2091632369 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100020947) 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, 1050010488 + 1050010489.

It is an arithmetic number, because the mean of its divisors is an integer number (1050010489).

Almost surely, 2^2100020977 is an apocalyptic number.

It is an amenable number.

2100020977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100020977 is an equidigital number, since it uses as much as digits as its factorization.

2100020977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 2100020977 is about 45825.9858268210. The cubic root of 2100020977 is about 1280.5834288954.

Adding to 2100020977 its reverse (7790200012), we get a palindrome (9890220989).

The spelling of 2100020977 in words is "two billion, one hundred million, twenty thousand, nine hundred seventy-seven".