10002220121221 has 16 divisors (see below), whose sum is σ = 10532733868800. Its totient is φ = 9472115395008.

The previous prime is 10002220121213. The next prime is 10002220121233. The reversal of 10002220121221 is 12212102220001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 10002220121221 - 2³ = 10002220121213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10002220121195 and 10002220121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10002220121251) 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, 856568635 + ... + 856580311.

It is an arithmetic number, because the mean of its divisors is an integer number (658295866800).

Almost surely, 2^{10002220121221} is an apocalyptic number.

It is an amenable number.

10002220121221 is a deficient number, since it is larger than the sum of its proper divisors (530513747579).

10002220121221 is a wasteful number, since it uses less digits than its factorization.

10002220121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25308.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10002220121221 its reverse (12212102220001), we get a palindrome (22214322341222).

The spelling of 10002220121221 in words is "ten trillion, two billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".