210001121100121 has 16 divisors (see below), whose sum is σ = 226809105250000. Its totient is φ = 193286602522368.

The previous prime is 210001121100083. The next prime is 210001121100131. The reversal of 210001121100121 is 121001121100012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5401854507721 + 204599266592400 = 2324189^2 + 14303820^2 .

It is a cyclic number.

It is not a de Polignac number, because 210001121100121 - 2⁴¹ = 207802097844569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (210001121100131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175206955 + ... + 176401471.

It is an arithmetic number, because the mean of its divisors is an integer number (14175569078125).

Almost surely, 2^{210001121100121} is an apocalyptic number.

It is an amenable number.

210001121100121 is a deficient number, since it is larger than the sum of its proper divisors (16807984149879).

210001121100121 is a wasteful number, since it uses less digits than its factorization.

210001121100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233628.

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

Adding to 210001121100121 its reverse (121001121100012), we get a palindrome (331002242200133).

The spelling of 210001121100121 in words is "two hundred ten trillion, one billion, one hundred twenty-one million, one hundred thousand, one hundred twenty-one".