102021001 has 2 divisors, whose sum is σ = 102021002. Its totient is φ = 102021000.

The previous prime is 102020993. The next prime is 102021037. The reversal of 102021001 is 100120201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 18481401 = 9140^2 + 4299^2 .

It is a cyclic number.

It is not a de Polignac number, because 102021001 - 2³ = 102020993 is a prime.

It is not a weakly prime, because it can be changed into another prime (102021091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010500 + 51010501.

It is an arithmetic number, because the mean of its divisors is an integer number (51010501).

Almost surely, 2^102021001 is an apocalyptic number.

It is an amenable number.

102021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021001 is an equidigital number, since it uses as much as digits as its factorization.

102021001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 102021001 is about 10100.5445892783. The cubic root of 102021001 is about 467.2649371630.

Adding to 102021001 its reverse (100120201), we get a palindrome (202141202).

The spelling of 102021001 in words is "one hundred two million, twenty-one thousand, one".