1021020601 has 2 divisors, whose sum is σ = 1021020602. Its totient is φ = 1021020600.

The previous prime is 1021020589. The next prime is 1021020607. The reversal of 1021020601 is 1060201201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654336400 + 366684201 = 25580^2 + 19149^2 .

It is an emirp because it is prime and its reverse (1060201201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021020601 - 2¹⁹ = 1020496313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021020607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510300 + 510510301.

It is an arithmetic number, because the mean of its divisors is an integer number (510510301).

Almost surely, 2^1021020601 is an apocalyptic number.

It is an amenable number.

1021020601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021020601 is an equidigital number, since it uses as much as digits as its factorization.

1021020601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1021020601 is about 31953.4129788979. The cubic root of 1021020601 is about 1006.9583362527.

Adding to 1021020601 its reverse (1060201201), we get a palindrome (2081221802).

The spelling of 1021020601 in words is "one billion, twenty-one million, twenty thousand, six hundred one".