102140320021 has 2 divisors, whose sum is σ = 102140320022. Its totient is φ = 102140320020.

The previous prime is 102140320001. The next prime is 102140320031. The reversal of 102140320021 is 120023041201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91754468100 + 10385851921 = 302910^2 + 101911^2 .

It is a cyclic number.

It is not a de Polignac number, because 102140320021 - 2¹¹ = 102140317973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102140319977 and 102140320004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102140320001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51070160010 + 51070160011.

It is an arithmetic number, because the mean of its divisors is an integer number (51070160011).

Almost surely, 2^102140320021 is an apocalyptic number.

It is an amenable number.

102140320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102140320021 is an equidigital number, since it uses as much as digits as its factorization.

102140320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 102140320021 its reverse (120023041201), we get a palindrome (222163361222).

The spelling of 102140320021 in words is "one hundred two billion, one hundred forty million, three hundred twenty thousand, twenty-one".