102021197 has 2 divisors, whose sum is σ = 102021198. Its totient is φ = 102021196.

The previous prime is 102021149. The next prime is 102021251. The reversal of 102021197 is 791120201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96550276 + 5470921 = 9826^2 + 2339^2 .

It is an emirp because it is prime and its reverse (791120201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102021197 - 2⁶ = 102021133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102041197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010598 + 51010599.

It is an arithmetic number, because the mean of its divisors is an integer number (51010599).

Almost surely, 2^102021197 is an apocalyptic number.

It is an amenable number.

102021197 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021197 is an equidigital number, since it uses as much as digits as its factorization.

102021197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 102021197 is about 10100.5542917208. The cubic root of 102021197 is about 467.2652363951.

Adding to 102021197 its reverse (791120201), we get a palindrome (893141398).

The spelling of 102021197 in words is "one hundred two million, twenty-one thousand, one hundred ninety-seven".