102421047977 has 2 divisors, whose sum is σ = 102421047978. Its totient is φ = 102421047976.

The previous prime is 102421047931. The next prime is 102421048003. The reversal of 102421047977 is 779740124201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53998605376 + 48422442601 = 232376^2 + 220051^2 .

It is a cyclic number.

It is not a de Polignac number, because 102421047977 - 2¹⁰ = 102421046953 is a prime.

It is not a weakly prime, because it can be changed into another prime (102421049977) 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, 51210523988 + 51210523989.

It is an arithmetic number, because the mean of its divisors is an integer number (51210523989).

Almost surely, 2^102421047977 is an apocalyptic number.

It is an amenable number.

102421047977 is a deficient number, since it is larger than the sum of its proper divisors (1).

102421047977 is an equidigital number, since it uses as much as digits as its factorization.

102421047977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 44.

The spelling of 102421047977 in words is "one hundred two billion, four hundred twenty-one million, forty-seven thousand, nine hundred seventy-seven".