20021021220211 has 12 divisors (see below), whose sum is σ = 22018648913856. Its totient is φ = 18190944128720.

The previous prime is 20021021220181. The next prime is 20021021220283. The reversal of 20021021220211 is 11202212012002.

It is a happy number.

It is not a de Polignac number, because 20021021220211 - 2¹⁵ = 20021021187443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021021221211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45161476 + ... + 45602641.

It is an arithmetic number, because the mean of its divisors is an integer number (1834887409488).

Almost surely, 2^{20021021220211} is an apocalyptic number.

20021021220211 is a deficient number, since it is larger than the sum of its proper divisors (1997627693645).

20021021220211 is a wasteful number, since it uses less digits than its factorization.

20021021220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90765962 (or 90765951 counting only the distinct ones).

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

Adding to 20021021220211 its reverse (11202212012002), we get a palindrome (31223233232213).

The spelling of 20021021220211 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred twenty thousand, two hundred eleven".