10211210111221 has 8 divisors (see below), whose sum is σ = 11844132837440. Its totient is φ = 8621831991168.

The previous prime is 10211210111189. The next prime is 10211210111227. The reversal of 10211210111221 is 12211101211201.

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 10211210111221 - 2⁵ = 10211210111189 is a prime.

It is a super-2 number, since 2×10211210111221² (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 = 10211210111195 and 10211210111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211210111227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10886151036 + ... + 10886151973.

It is an arithmetic number, because the mean of its divisors is an integer number (1480516604680).

Almost surely, 2^{10211210111221} is an apocalyptic number.

It is an amenable number.

10211210111221 is a deficient number, since it is larger than the sum of its proper divisors (1632922726219).

10211210111221 is an equidigital number, since it uses as much as digits as its factorization.

10211210111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21772303083.

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

Adding to 10211210111221 its reverse (12211101211201), we get a palindrome (22422311322422).

The spelling of 10211210111221 in words is "ten trillion, two hundred eleven billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".