20002020020021 has 16 divisors (see below), whose sum is σ = 22001436995328. Its totient is φ = 18068520504000.

The previous prime is 20002020019931. The next prime is 20002020020041. The reversal of 20002020020021 is 12002002020002.

It is a cyclic number.

It is not a de Polignac number, because 20002020020021 - 2¹⁸ = 20002019757877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20002020019984 and 20002020020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002020020041) 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, 3566846 + ... + 7261296.

It is an arithmetic number, because the mean of its divisors is an integer number (1375089812208).

Almost surely, 2^{20002020020021} is an apocalyptic number.

It is an amenable number.

20002020020021 is a deficient number, since it is larger than the sum of its proper divisors (1999416975307).

20002020020021 is a wasteful number, since it uses less digits than its factorization.

20002020020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703372.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 20002020020021 its reverse (12002002020002), we get a palindrome (32004022040023).

The spelling of 20002020020021 in words is "twenty trillion, two billion, twenty million, twenty thousand, twenty-one".