2000020021 has 4 divisors (see below), whose sum is σ = 2002948992. Its totient is φ = 1997091052.

The previous prime is 2000020007. The next prime is 2000020027. The reversal of 2000020021 is 1200200002.

It is a happy number.

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 2000020021 - 2⁹ = 2000019509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2000019986 and 2000020013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2000020027) 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, 1463461 + ... + 1464826.

It is an arithmetic number, because the mean of its divisors is an integer number (500737248).

Almost surely, 2^2000020021 is an apocalyptic number.

It is an amenable number.

2000020021 is a deficient number, since it is larger than the sum of its proper divisors (2928971).

2000020021 is an equidigital number, since it uses as much as digits as its factorization.

2000020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928970.

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

The square root of 2000020021 is about 44721.5833910205. The cubic root of 2000020021 is about 1259.9252540274.

Adding to 2000020021 its reverse (1200200002), we get a palindrome (3200220023).

The spelling of 2000020021 in words is "two billion, twenty thousand, twenty-one".