221212033 has 8 divisors (see below), whose sum is σ = 258193152. Its totient is φ = 185575776.

The previous prime is 221212031. The next prime is 221212049. The reversal of 221212033 is 330212122.

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 221212033 - 2¹ = 221212031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211998 and 221212016.

It is not an unprimeable number, because it can be changed into a prime (221212031) 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, 335860 + ... + 336517.

It is an arithmetic number, because the mean of its divisors is an integer number (32274144).

Almost surely, 2^221212033 is an apocalyptic number.

It is an amenable number.

221212033 is a deficient number, since it is larger than the sum of its proper divisors (36981119).

221212033 is an equidigital number, since it uses as much as digits as its factorization.

221212033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672431.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221212033 is about 14873.1984791436. The cubic root of 221212033 is about 604.7876521807.

Adding to 221212033 its reverse (330212122), we get a palindrome (551424155).

The spelling of 221212033 in words is "two hundred twenty-one million, two hundred twelve thousand, thirty-three".