20000000001021 has 16 divisors (see below), whose sum is σ = 27586322280000. Its totient is φ = 12873509374208.

The previous prime is 20000000000977. The next prime is 20000000001031. The reversal of 20000000001021 is 12010000000002.

It is a happy number.

It is not a de Polignac number, because 20000000001021 - 2¹⁰ = 19999999999997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000000001031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38500405 + ... + 39016421.

It is an arithmetic number, because the mean of its divisors is an integer number (1724145142500).

Almost surely, 2^{20000000001021} is an apocalyptic number.

It is an amenable number.

20000000001021 is a deficient number, since it is larger than the sum of its proper divisors (7586322278979).

20000000001021 is a wasteful number, since it uses less digits than its factorization.

20000000001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961548.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 20000000001021 its reverse (12010000000002), we get a palindrome (32010000001023).

The spelling of 20000000001021 in words is "twenty trillion, one thousand, twenty-one".