210221122110101 has 4 divisors (see below), whose sum is σ = 210223173530604. Its totient is φ = 210219070689600.

The previous prime is 210221122110071. The next prime is 210221122110119. The reversal of 210221122110101 is 101011221122012.

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 146619380605201 + 63601741504900 = 12108649^2 + 7975070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210221122110101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 210221122110101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221122140101) 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, 1025556530 + ... + 1025761491.

It is an arithmetic number, because the mean of its divisors is an integer number (52555793382651).

Almost surely, 2^{210221122110101} is an apocalyptic number.

It is an amenable number.

210221122110101 is a deficient number, since it is larger than the sum of its proper divisors (2051420503).

210221122110101 is a wasteful number, since it uses less digits than its factorization.

210221122110101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051420502.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 210221122110101 its reverse (101011221122012), we get a palindrome (311232343232113).

The spelling of 210221122110101 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred ten thousand, one hundred one".