1652002021 has 2 divisors, whose sum is σ = 1652002022. Its totient is φ = 1652002020.

The previous prime is 1652002007. The next prime is 1652002039. The reversal of 1652002021 is 1202002561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1580937121 + 71064900 = 39761^2 + 8430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1652002021 - 2⁷ = 1652001893 is a prime.

It is a super-3 number, since 3×1652002021³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1652002021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1652002321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 826001010 + 826001011.

It is an arithmetic number, because the mean of its divisors is an integer number (826001011).

Almost surely, 2^1652002021 is an apocalyptic number.

It is an amenable number.

1652002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1652002021 is an equidigital number, since it uses as much as digits as its factorization.

1652002021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1652002021 is about 40644.8277275227. The cubic root of 1652002021 is about 1182.1434804634.

Adding to 1652002021 its reverse (1202002561), we get a palindrome (2854004582).

The spelling of 1652002021 in words is "one billion, six hundred fifty-two million, two thousand, twenty-one".