210001112202121 has 8 divisors (see below), whose sum is σ = 210216123338760. Its totient is φ = 209786180195328.

The previous prime is 210001112202109. The next prime is 210001112202137. The reversal of 210001112202121 is 121202211100012.

It can be written as a sum of positive squares in 4 ways, for example, as 39015151856521 + 170985960345600 = 6246211^2 + 13076160^2 .

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 210001112202121 - 2²¹ = 210001110104969 is a prime.

It is a super-2 number, since 2×210001112202121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210001112202095 and 210001112202104.

It is not an unprimeable number, because it can be changed into a prime (210001112202181) 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, 14471256 + ... + 25088233.

It is an arithmetic number, because the mean of its divisors is an integer number (26277015417345).

Almost surely, 2^{210001112202121} is an apocalyptic number.

It is an amenable number.

210001112202121 is a deficient number, since it is larger than the sum of its proper divisors (215011136639).

210001112202121 is a wasteful number, since it uses less digits than its factorization.

210001112202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39564923.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210001112202121 its reverse (121202211100012), we get a palindrome (331203323302133).

The spelling of 210001112202121 in words is "two hundred ten trillion, one billion, one hundred twelve million, two hundred two thousand, one hundred twenty-one".