2021000002 has 12 divisors (see below), whose sum is σ = 3526438950. Its totient is φ = 866142816.

The previous prime is 2020999987. The next prime is 2021000017. The reversal of 2021000002 is 2000001202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2020999987) and next prime (2021000017).

It can be written as a sum of positive squares in only one way, i.e., 1336706721 + 684293281 = 36561^2 + 26159^2 .

It is a Harshad number since it is a multiple of its sum of digits (7).

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 10311127 + ... + 10311322.

Almost surely, 2^2021000002 is an apocalyptic number.

2021000002 is a deficient number, since it is larger than the sum of its proper divisors (1505438948).

2021000002 is a wasteful number, since it uses less digits than its factorization.

2021000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20622465 (or 20622458 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 2021000002 is about 44955.5336082222. The cubic root of 2021000002 is about 1264.3154293602.

Adding to 2021000002 its reverse (2000001202), we get a palindrome (4021001204).

The spelling of 2021000002 in words is "two billion, twenty-one million, two", and thus it is an aban number and an uban number.