20211102020021 has 16 divisors (see below), whose sum is σ = 22133743123200. Its totient is φ = 18302696236800.

The previous prime is 20211102019957. The next prime is 20211102020051. The reversal of 20211102020021 is 12002020111202.

It is a cyclic number.

It is not a de Polignac number, because 20211102020021 - 2⁶ = 20211102019957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211102019978 and 20211102020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211102020051) 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, 16363025 + ... + 17554793.

It is an arithmetic number, because the mean of its divisors is an integer number (1383358945200).

Almost surely, 2^{20211102020021} is an apocalyptic number.

It is an amenable number.

20211102020021 is a deficient number, since it is larger than the sum of its proper divisors (1922641103179).

20211102020021 is a wasteful number, since it uses less digits than its factorization.

20211102020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197740.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20211102020021 its reverse (12002020111202), we get a palindrome (32213122131223).

The spelling of 20211102020021 in words is "twenty trillion, two hundred eleven billion, one hundred two million, twenty thousand, twenty-one".