10021121201221 has 4 divisors (see below), whose sum is σ = 10791976678252. Its totient is φ = 9250265724192.

The previous prime is 10021121201207. The next prime is 10021121201227. The reversal of 10021121201221 is 12210212112001.

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 641841322500 + 9379279878721 = 801150^2 + 3062561^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021121201221 - 2¹⁵ = 10021121168453 is a prime.

It is a super-2 number, since 2×10021121201221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021121201195 and 10021121201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021121201227) 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, 385427738496 + ... + 385427738521.

It is an arithmetic number, because the mean of its divisors is an integer number (2697994169563).

Almost surely, 2^{10021121201221} is an apocalyptic number.

It is an amenable number.

10021121201221 is a deficient number, since it is larger than the sum of its proper divisors (770855477031).

10021121201221 is an equidigital number, since it uses as much as digits as its factorization.

10021121201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770855477030.

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

Adding to 10021121201221 its reverse (12210212112001), we get a palindrome (22231333313222).

The spelling of 10021121201221 in words is "ten trillion, twenty-one billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty-one".