20002210021 has 16 divisors (see below), whose sum is σ = 20922794928. Its totient is φ = 19106150400.

The previous prime is 20002210009. The next prime is 20002210051. The reversal of 20002210021 is 12001220002.

It can be written as a sum of positive squares in 8 ways, for example, as 4663387521 + 15338822500 = 68289^2 + 123850^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002210021 - 2⁵ = 20002209989 is a prime.

It is a Duffinian number.

20002210021 is a modest number, since divided by 210021 gives 20002 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002210051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385651 + ... + 434431.

It is an arithmetic number, because the mean of its divisors is an integer number (1307674683).

Almost surely, 2^20002210021 is an apocalyptic number.

It is an amenable number.

20002210021 is a deficient number, since it is larger than the sum of its proper divisors (920584907).

20002210021 is a wasteful number, since it uses less digits than its factorization.

20002210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49032.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20002210021 its reverse (12001220002), we get a palindrome (32003430023).

The spelling of 20002210021 in words is "twenty billion, two million, two hundred ten thousand, twenty-one".