212101210100121 has 16 divisors (see below), whose sum is σ = 285618568614720. Its totient is φ = 139994351386560.

The previous prime is 212101210100113. The next prime is 212101210100147. The reversal of 212101210100121 is 121001012101212.

It is a happy number.

It is not a de Polignac number, because 212101210100121 - 2³ = 212101210100113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212101210100121.

It is not an unprimeable number, because it can be changed into a prime (212101210140121) 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, 252358150 + ... + 253197231.

It is an arithmetic number, because the mean of its divisors is an integer number (17851160538420).

Almost surely, 2^{212101210100121} is an apocalyptic number.

It is an amenable number.

212101210100121 is a deficient number, since it is larger than the sum of its proper divisors (73517358514599).

212101210100121 is a wasteful number, since it uses less digits than its factorization.

212101210100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505556776.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212101210100121 its reverse (121001012101212), we get a palindrome (333102222201333).

The spelling of 212101210100121 in words is "two hundred twelve trillion, one hundred one billion, two hundred ten million, one hundred thousand, one hundred twenty-one".