210121121211101 has 4 divisors (see below), whose sum is σ = 210121277343900. Its totient is φ = 210120965078304.

The previous prime is 210121121211011. The next prime is 210121121211103. The reversal of 210121121211101 is 101112121121012.

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 142418685244900 + 67702435966201 = 11933930^2 + 8228149^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121121211101 - 2⁴² = 205723074699997 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 210121121211101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121121211103) 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, 76030016 + ... + 78745193.

It is an arithmetic number, because the mean of its divisors is an integer number (52530319335975).

Almost surely, 2^{210121121211101} is an apocalyptic number.

It is an amenable number.

210121121211101 is a deficient number, since it is larger than the sum of its proper divisors (156132799).

210121121211101 is a wasteful number, since it uses less digits than its factorization.

210121121211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156132798.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 210121121211101 its reverse (101112121121012), we get a palindrome (311233242332113).

The spelling of 210121121211101 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, one hundred one".