102113030021 has 2 divisors, whose sum is σ = 102113030022. Its totient is φ = 102113030020.

The previous prime is 102113030017. The next prime is 102113030077. The reversal of 102113030021 is 120030311201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98524420996 + 3588609025 = 313886^2 + 59905^2 .

It is an emirp because it is prime and its reverse (120030311201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102113030021 - 2² = 102113030017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102113029978 and 102113030005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102113030081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51056515010 + 51056515011.

It is an arithmetic number, because the mean of its divisors is an integer number (51056515011).

Almost surely, 2^102113030021 is an apocalyptic number.

It is an amenable number.

102113030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102113030021 is an equidigital number, since it uses as much as digits as its factorization.

102113030021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 102113030021 its reverse (120030311201), we get a palindrome (222143341222).

The spelling of 102113030021 in words is "one hundred two billion, one hundred thirteen million, thirty thousand, twenty-one".