210221121101 has 4 divisors (see below), whose sum is σ = 210232113852. Its totient is φ = 210210128352.

The previous prime is 210221121059. The next prime is 210221121137. The reversal of 210221121101 is 101121122012.

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 88524100900 + 121697020201 = 297530^2 + 348851^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221121101 - 2¹⁸ = 210220858957 is a prime.

It is a super-2 number, since 2×210221121101² (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 (210221121161) 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, 5467640 + ... + 5505953.

It is an arithmetic number, because the mean of its divisors is an integer number (52558028463).

Almost surely, 2^210221121101 is an apocalyptic number.

It is an amenable number.

210221121101 is a deficient number, since it is larger than the sum of its proper divisors (10992751).

210221121101 is a wasteful number, since it uses less digits than its factorization.

210221121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10992750.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210221121101 its reverse (101121122012), we get a palindrome (311342243113).

The spelling of 210221121101 in words is "two hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred one".