20001002210021 has 16 divisors (see below), whose sum is σ = 22986951361920. Its totient is φ = 17047238408640.

The previous prime is 20001002209967. The next prime is 20001002210027. The reversal of 20001002210021 is 12001220010002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20001002210021 - 2¹⁴ = 20001002193637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001002209984 and 20001002210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001002210027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11528855 + ... + 13149771.

It is an arithmetic number, because the mean of its divisors is an integer number (1436684460120).

Almost surely, 2^{20001002210021} is an apocalyptic number.

It is an amenable number.

20001002210021 is a deficient number, since it is larger than the sum of its proper divisors (2985949151899).

20001002210021 is a wasteful number, since it uses less digits than its factorization.

20001002210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630844.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001002210021 its reverse (12001220010002), we get a palindrome (32002222220023).

The spelling of 20001002210021 in words is "twenty trillion, one billion, two million, two hundred ten thousand, twenty-one".