20211211202021 has 16 divisors (see below), whose sum is σ = 23986041518208. Its totient is φ = 16669835769600.

The previous prime is 20211211201991. The next prime is 20211211202071. The reversal of 20211211202021 is 12020211211202.

It is a cyclic number.

It is not a de Polignac number, because 20211211202021 - 2³⁰ = 20210137460197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211211202071) 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, 482323835 + ... + 482365736.

It is an arithmetic number, because the mean of its divisors is an integer number (1499127594888).

Almost surely, 2^{20211211202021} is an apocalyptic number.

It is an amenable number.

20211211202021 is a deficient number, since it is larger than the sum of its proper divisors (3774830316187).

20211211202021 is an equidigital number, since it uses as much as digits as its factorization.

20211211202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964689692.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20211211202021 its reverse (12020211211202), we get a palindrome (32231422413223).

The spelling of 20211211202021 in words is "twenty trillion, two hundred eleven billion, two hundred eleven million, two hundred two thousand, twenty-one".