1020002021 has 4 divisors (see below), whose sum is σ = 1052905344. Its totient is φ = 987098700.

The previous prime is 1020002017. The next prime is 1020002041. The reversal of 1020002021 is 1202000201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020002021 - 2² = 1020002017 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 (1020002041) 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, 16451615 + ... + 16451676.

It is an arithmetic number, because the mean of its divisors is an integer number (263226336).

Almost surely, 2^1020002021 is an apocalyptic number.

It is an amenable number.

1020002021 is a deficient number, since it is larger than the sum of its proper divisors (32903323).

1020002021 is an equidigital number, since it uses as much as digits as its factorization.

1020002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32903322.

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

The square root of 1020002021 is about 31937.4704853093. The cubic root of 1020002021 is about 1006.6233743912.

Adding to 1020002021 its reverse (1202000201), we get a palindrome (2222002222).

The spelling of 1020002021 in words is "one billion, twenty million, two thousand, twenty-one".