210102100121 has 4 divisors (see below), whose sum is σ = 210451688244. Its totient is φ = 209752512000.

The previous prime is 210102100097. The next prime is 210102100123. The reversal of 210102100121 is 121001201012.

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 72905940121 + 137196160000 = 270011^2 + 370400^2 .

It is a cyclic number.

It is not a de Polignac number, because 210102100121 - 2³⁴ = 192922230937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210102100123) 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, 174793160 + ... + 174794361.

It is an arithmetic number, because the mean of its divisors is an integer number (52612922061).

Almost surely, 2^210102100121 is an apocalyptic number.

It is an amenable number.

210102100121 is a deficient number, since it is larger than the sum of its proper divisors (349588123).

210102100121 is an equidigital number, since it uses as much as digits as its factorization.

210102100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349588122.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210102100121 its reverse (121001201012), we get a palindrome (331103301133).

The spelling of 210102100121 in words is "two hundred ten billion, one hundred two million, one hundred thousand, one hundred twenty-one".