221212331321211 has 8 divisors (see below), whose sum is σ = 327721972327760. Its totient is φ = 147474887547456.

The previous prime is 221212331321147. The next prime is 221212331321237. The reversal of 221212331321211 is 112123133212122.

221212331321211 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 1 + 2 + 331 + 321 + 2 + 1 + 1 = 666.

221212331321211 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221212331321211 - 2⁶ = 221212331321147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8193049308193 = 221212331321211 / (2 + 2 + 1 + 2 + 1 + 2 + 3 + 3 + 1 + 3 + 2 + 1 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212331321251) 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, 4096524654070 + ... + 4096524654123.

It is an arithmetic number, because the mean of its divisors is an integer number (40965246540970).

Almost surely, 2^{221212331321211} is an apocalyptic number.

221212331321211 is a deficient number, since it is larger than the sum of its proper divisors (106509641006549).

221212331321211 is an equidigital number, since it uses as much as digits as its factorization.

221212331321211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8193049308202 (or 8193049308196 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

Adding to 221212331321211 its reverse (112123133212122), we get a palindrome (333335464533333).

The spelling of 221212331321211 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred thirty-one million, three hundred twenty-one thousand, two hundred eleven".