221211221021 has 8 divisors (see below), whose sum is σ = 252857829504. Its totient is φ = 189575863920.

The previous prime is 221211220963. The next prime is 221211221047. The reversal of 221211221021 is 120122112122.

221211221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221211221021 - 2²⁶ = 221144112157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211221051) 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, 2770670 + ... + 2849391.

It is an arithmetic number, because the mean of its divisors is an integer number (31607228688).

Almost surely, 2^221211221021 is an apocalyptic number.

It is an amenable number.

221211221021 is a deficient number, since it is larger than the sum of its proper divisors (31646608483).

221211221021 is an equidigital number, since it uses as much as digits as its factorization.

221211221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5625691.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221211221021 its reverse (120122112122), we get a palindrome (341333333143).

The spelling of 221211221021 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, twenty-one".