2000022021 has 6 divisors (see below), whose sum is σ = 2888920710. Its totient is φ = 1333348008.

The previous prime is 2000022007. The next prime is 2000022053. The reversal of 2000022021 is 1202200002.

It can be written as a sum of positive squares in only one way, i.e., 1172309121 + 827712900 = 34239^2 + 28770^2 .

It is not a de Polignac number, because 2000022021 - 2⁶ = 2000021957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 222224669 = 2000022021 / (2 + 0 + 0 + 0 + 0 + 2 + 2 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 2000021994 and 2000022012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2000022721) 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 in 5 ways as a sum of consecutive naturals, for example, 111112326 + ... + 111112343.

It is an arithmetic number, because the mean of its divisors is an integer number (481486785).

Almost surely, 2^2000022021 is an apocalyptic number.

It is an amenable number.

2000022021 is a deficient number, since it is larger than the sum of its proper divisors (888898689).

2000022021 is a wasteful number, since it uses less digits than its factorization.

2000022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222224675 (or 222224672 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2000022021 is about 44721.6057515828. The cubic root of 2000022021 is about 1259.9256739981.

Adding to 2000022021 its reverse (1202200002), we get a palindrome (3202222023).

The spelling of 2000022021 in words is "two billion, twenty-two thousand, twenty-one".