10021221221 has 8 divisors (see below), whose sum is σ = 10933793184. Its totient is φ = 9108907920.

The previous prime is 10021221191. The next prime is 10021221239. The reversal of 10021221221 is 12212212001.

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 10021221221 - 2⁶ = 10021221157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021221196 and 10021221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021221241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21326 + ... + 143168.

It is an arithmetic number, because the mean of its divisors is an integer number (1366724148).

Almost surely, 2^10021221221 is an apocalyptic number.

10021221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10021221221 is a deficient number, since it is larger than the sum of its proper divisors (912571963).

10021221221 is a wasteful number, since it uses less digits than its factorization.

10021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129331.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10021221221 its reverse (12212212001), we get a palindrome (22233433222).

The spelling of 10021221221 in words is "ten billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".