21020220020211 has 4 divisors (see below), whose sum is σ = 28026960026952. Its totient is φ = 14013480013472.

The previous prime is 21020220020209. The next prime is 21020220020221. The reversal of 21020220020211 is 11202002202012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21020220020211 - 2¹ = 21020220020209 is a prime.

It is a super-3 number, since 3×21020220020211³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020220020221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503370003366 + ... + 3503370003371.

It is an arithmetic number, because the mean of its divisors is an integer number (7006740006738).

Almost surely, 2^{21020220020211} is an apocalyptic number.

21020220020211 is a deficient number, since it is larger than the sum of its proper divisors (7006740006741).

21020220020211 is an equidigital number, since it uses as much as digits as its factorization.

21020220020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7006740006740.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020220020211 its reverse (11202002202012), we get a palindrome (32222222222223).

The spelling of 21020220020211 in words is "twenty-one trillion, twenty billion, two hundred twenty million, twenty thousand, two hundred eleven".