10021212211221 has 8 divisors (see below), whose sum is σ = 14846240312960. Its totient is φ = 6680808140796.

The previous prime is 10021212211201. The next prime is 10021212211247. The reversal of 10021212211221 is 12211221212001.

10021212211221 is a `hidden beast` number, since 1 + 0 + 0 + 21 + 212 + 211 + 221 = 666.

It is not a de Polignac number, because 10021212211221 - 2¹⁴ = 10021212194837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021212211194 and 10021212211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021212211201) 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, 185578003885 + ... + 185578003938.

It is an arithmetic number, because the mean of its divisors is an integer number (1855780039120).

Almost surely, 2^{10021212211221} is an apocalyptic number.

It is an amenable number.

10021212211221 is a deficient number, since it is larger than the sum of its proper divisors (4825028101739).

10021212211221 is an equidigital number, since it uses as much as digits as its factorization.

10021212211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371156007832 (or 371156007826 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 10021212211221 its reverse (12211221212001), we get a palindrome (22232433423222).

The spelling of 10021212211221 in words is "ten trillion, twenty-one billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty-one".