210222221021 has 4 divisors (see below), whose sum is σ = 210256842972. Its totient is φ = 210187599072.

The previous prime is 210222220997. The next prime is 210222221071. The reversal of 210222221021 is 120122222012.

It is a happy number.

210222221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 133068825796 + 77153395225 = 364786^2 + 277765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210222221021 is a prime.

It is a super-2 number, since 2×210222221021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210222221071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17301866 + ... + 17314011.

It is an arithmetic number, because the mean of its divisors is an integer number (52564210743).

Almost surely, 2^210222221021 is an apocalyptic number.

It is an amenable number.

210222221021 is a deficient number, since it is larger than the sum of its proper divisors (34621951).

210222221021 is an equidigital number, since it uses as much as digits as its factorization.

210222221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34621950.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 210222221021 its reverse (120122222012), we get a palindrome (330344443033).

Subtracting from 210222221021 its reverse (120122222012), we obtain a palindrome (90099999009).

The spelling of 210222221021 in words is "two hundred ten billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".