210211222021021 has 8 divisors (see below), whose sum is σ = 226381766985080. Its totient is φ = 194040741480192.

The previous prime is 210211222021001. The next prime is 210211222021067. The reversal of 210211222021021 is 120120222112012.

It can be written as a sum of positive squares in 4 ways, for example, as 1466835876900 + 208744386144121 = 1211130^2 + 14447989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210211222021021 - 2²⁵ = 210211188466589 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 210211222021021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211222021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9219816 + ... + 22481713.

It is an arithmetic number, because the mean of its divisors is an integer number (28297720873135).

Almost surely, 2^{210211222021021} is an apocalyptic number.

It is an amenable number.

210211222021021 is a deficient number, since it is larger than the sum of its proper divisors (16170544964059).

210211222021021 is a wasteful number, since it uses less digits than its factorization.

210211222021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32211615.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 210211222021021 its reverse (120120222112012), we get a palindrome (330331444133033).

Subtracting from 210211222021021 its reverse (120120222112012), we obtain a palindrome (90090999909009).

The spelling of 210211222021021 in words is "two hundred ten trillion, two hundred eleven billion, two hundred twenty-two million, twenty-one thousand, twenty-one".