1021020197 has 4 divisors (see below), whose sum is σ = 1056227820. Its totient is φ = 985812576.

The previous prime is 1021020181. The next prime is 1021020199. The reversal of 1021020197 is 7910201201.

1021020197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 243391201 + 777628996 = 15601^2 + 27886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021020197 - 2⁴ = 1021020181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021020199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17603768 + ... + 17603825.

It is an arithmetic number, because the mean of its divisors is an integer number (264056955).

Almost surely, 2^1021020197 is an apocalyptic number.

It is an amenable number.

1021020197 is a deficient number, since it is larger than the sum of its proper divisors (35207623).

1021020197 is an equidigital number, since it uses as much as digits as its factorization.

1021020197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35207622.

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

The square root of 1021020197 is about 31953.4066571938. The cubic root of 1021020197 is about 1006.9582034407.

Adding to 1021020197 its reverse (7910201201), we get a palindrome (8931221398).

The spelling of 1021020197 in words is "one billion, twenty-one million, twenty thousand, one hundred ninety-seven".