210021020221211 has 4 divisors (see below), whose sum is σ = 217263124366800. Its totient is φ = 202778916075624.

The previous prime is 210021020221183. The next prime is 210021020221237. The reversal of 210021020221211 is 112122020120012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021020221211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210021020221211.

It is not an unprimeable number, because it can be changed into a prime (210021020221261) 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, 3621052072751 + ... + 3621052072808.

It is an arithmetic number, because the mean of its divisors is an integer number (54315781091700).

Almost surely, 2^{210021020221211} is an apocalyptic number.

210021020221211 is a deficient number, since it is larger than the sum of its proper divisors (7242104145589).

210021020221211 is an equidigital number, since it uses as much as digits as its factorization.

210021020221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7242104145588.

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

Adding to 210021020221211 its reverse (112122020120012), we get a palindrome (322143040341223).

The spelling of 210021020221211 in words is "two hundred ten trillion, twenty-one billion, twenty million, two hundred twenty-one thousand, two hundred eleven".