221222021211 has 32 divisors (see below), whose sum is σ = 340997544000. Its totient is φ = 141572600064.

The previous prime is 221222021179. The next prime is 221222021243. The reversal of 221222021211 is 112120222122.

It is a happy number.

221222021211 is a `hidden beast` number, since 2 + 212 + 220 + 21 + 211 = 666.

It is an interprime number because it is at equal distance from previous prime (221222021179) and next prime (221222021243).

It is not a de Polignac number, because 221222021211 - 2⁵ = 221222021179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221222021311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 681106 + ... + 952023.

It is an arithmetic number, because the mean of its divisors is an integer number (10656173250).

Almost surely, 2^221222021211 is an apocalyptic number.

221222021211 is a deficient number, since it is larger than the sum of its proper divisors (119775522789).

221222021211 is a wasteful number, since it uses less digits than its factorization.

221222021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633340 (or 1633334 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221222021211 its reverse (112120222122), we get a palindrome (333342243333).

The spelling of 221222021211 in words is "two hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, two hundred eleven".