20012211202021 has 2 divisors, whose sum is σ = 20012211202022. Its totient is φ = 20012211202020.

The previous prime is 20012211201949. The next prime is 20012211202099. The reversal of 20012211202021 is 12020211221002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14118430502500 + 5893780699521 = 3757450^2 + 2427711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012211202021 - 2¹³ = 20012211193829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012211201986 and 20012211202004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012211200021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006105601010 + 10006105601011.

It is an arithmetic number, because the mean of its divisors is an integer number (10006105601011).

Almost surely, 2^{20012211202021} is an apocalyptic number.

It is an amenable number.

20012211202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012211202021 is an equidigital number, since it uses as much as digits as its factorization.

20012211202021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20012211202021 its reverse (12020211221002), we get a palindrome (32032422423023).

The spelling of 20012211202021 in words is "twenty trillion, twelve billion, two hundred eleven million, two hundred two thousand, twenty-one".