210121200011101 has 4 divisors (see below), whose sum is σ = 210180673889532. Its totient is φ = 210061726132672.

The previous prime is 210121200011089. The next prime is 210121200011111. The reversal of 210121200011101 is 101110002121012.

It is a happy number.

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 165237913160100 + 44883286851001 = 12854490^2 + 6699499^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121200011101 - 2¹⁷ = 210121199880029 is a prime.

It is a super-2 number, since 2×210121200011101² (a number of 29 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 (210121200011111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29736933916 + ... + 29736940981.

It is an arithmetic number, because the mean of its divisors is an integer number (52545168472383).

Almost surely, 2^{210121200011101} is an apocalyptic number.

It is an amenable number.

210121200011101 is a deficient number, since it is larger than the sum of its proper divisors (59473878431).

210121200011101 is an equidigital number, since it uses as much as digits as its factorization.

210121200011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59473878430.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210121200011101 its reverse (101110002121012), we get a palindrome (311231202132113).

The spelling of 210121200011101 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred million, eleven thousand, one hundred one".