221012211211 has 4 divisors (see below), whose sum is σ = 241104230424. Its totient is φ = 200920192000.

The previous prime is 221012211187. The next prime is 221012211223. The reversal of 221012211211 is 112112210122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221012211211 - 2²⁹ = 220475340299 is a prime.

It is a super-3 number, since 3×221012211211³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221012211011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10046009590 + ... + 10046009611.

It is an arithmetic number, because the mean of its divisors is an integer number (60276057606).

Almost surely, 2^221012211211 is an apocalyptic number.

221012211211 is a deficient number, since it is larger than the sum of its proper divisors (20092019213).

221012211211 is a wasteful number, since it uses less digits than its factorization.

221012211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20092019212.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221012211211 its reverse (112112210122), we get a palindrome (333124421333).

It can be divided in two parts, 2210122 and 11211, that multiplied together give a palindrome (24777677742).

The spelling of 221012211211 in words is "two hundred twenty-one billion, twelve million, two hundred eleven thousand, two hundred eleven".