20002243021 has 4 divisors (see below), whose sum is σ = 20003961852. Its totient is φ = 20000524192.

The previous prime is 20002242979. The next prime is 20002243087. The reversal of 20002243021 is 12034220002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152250921 + 19849992100 = 12339^2 + 140890^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002243021 - 2⁷ = 20002242893 is a prime.

It is a super-2 number, since 2×20002243021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002242986 and 20002243004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002243421) 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, 841840 + ... + 865273.

It is an arithmetic number, because the mean of its divisors is an integer number (5000990463).

Almost surely, 2^20002243021 is an apocalyptic number.

It is an amenable number.

20002243021 is a deficient number, since it is larger than the sum of its proper divisors (1718831).

20002243021 is a wasteful number, since it uses less digits than its factorization.

20002243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718830.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20002243021 its reverse (12034220002), we get a palindrome (32036463023).

The spelling of 20002243021 in words is "twenty billion, two million, two hundred forty-three thousand, twenty-one".