101212121010221 has 4 divisors (see below), whose sum is σ = 108997668780252. Its totient is φ = 93426573240192.

The previous prime is 101212121010181. The next prime is 101212121010271. The reversal of 101212121010221 is 122010121212101.

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 52836340237321 + 48375780772900 = 7268861^2 + 6955270^2 .

It is a cyclic number.

It is not a de Polignac number, because 101212121010221 - 2³⁴ = 101194941141037 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 101212121010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212121010271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3892773884996 + ... + 3892773885021.

It is an arithmetic number, because the mean of its divisors is an integer number (27249417195063).

Almost surely, 2^{101212121010221} is an apocalyptic number.

It is an amenable number.

101212121010221 is a deficient number, since it is larger than the sum of its proper divisors (7785547770031).

101212121010221 is an equidigital number, since it uses as much as digits as its factorization.

101212121010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7785547770030.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 101212121010221 its reverse (122010121212101), we get a palindrome (223222242222322).

The spelling of 101212121010221 in words is "one hundred one trillion, two hundred twelve billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".