10212100121221 has 8 divisors (see below), whose sum is σ = 10318615493144. Its totient is φ = 10105609973760.

The previous prime is 10212100121213. The next prime is 10212100121317. The reversal of 10212100121221 is 12212100121201.

It can be written as a sum of positive squares in 4 ways, for example, as 1218782880225 + 8993317240996 = 1103985^2 + 2998886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10212100121221 - 2³ = 10212100121213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10212100121195 and 10212100121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212100151221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5491650 + ... + 7112131.

It is an arithmetic number, because the mean of its divisors is an integer number (1289826936643).

Almost surely, 2^{10212100121221} is an apocalyptic number.

It is an amenable number.

10212100121221 is a deficient number, since it is larger than the sum of its proper divisors (106515371923).

10212100121221 is an equidigital number, since it uses as much as digits as its factorization.

10212100121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12612231.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 10212100121221 its reverse (12212100121201), we get a palindrome (22424200242422).

The spelling of 10212100121221 in words is "ten trillion, two hundred twelve billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".