212211221221021 has 8 divisors (see below), whose sum is σ = 235871134393824. Its totient is φ = 189279305376720.

The previous prime is 212211221221007. The next prime is 212211221221033. The reversal of 212211221221021 is 120122122112212.

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 212211221221021 - 2⁵ = 212211221220989 is a prime.

It is a super-2 number, since 2×212211221221021² (a number of 29 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 = 212211221220983 and 212211221221001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211221221001) 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, 181999331511 + ... + 181999332676.

It is an arithmetic number, because the mean of its divisors is an integer number (29483891799228).

Almost surely, 2^{212211221221021} is an apocalyptic number.

It is an amenable number.

212211221221021 is a deficient number, since it is larger than the sum of its proper divisors (23659913172803).

212211221221021 is a wasteful number, since it uses less digits than its factorization.

212211221221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363998664251.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 212211221221021 its reverse (120122122112212), we get a palindrome (332333343333233).

The spelling of 212211221221021 in words is "two hundred twelve trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty-one".