1020421310197 has 2 divisors, whose sum is σ = 1020421310198. Its totient is φ = 1020421310196.

The previous prime is 1020421310179. The next prime is 1020421310243. The reversal of 1020421310197 is 7910131240201.

It is a happy number.

Together with previous prime (1020421310179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1011410364721 + 9010945476 = 1005689^2 + 94926^2 .

It is an emirp because it is prime and its reverse (7910131240201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020421310197 - 2³⁵ = 986061571829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020421310177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510210655098 + 510210655099.

It is an arithmetic number, because the mean of its divisors is an integer number (510210655099).

Almost surely, 2^{1020421310197} is an apocalyptic number.

It is an amenable number.

1020421310197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020421310197 is an equidigital number, since it uses as much as digits as its factorization.

1020421310197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

Adding to 1020421310197 its reverse (7910131240201), we get a palindrome (8930552550398).

The spelling of 1020421310197 in words is "one trillion, twenty billion, four hundred twenty-one million, three hundred ten thousand, one hundred ninety-seven".