221021211012211 has 4 divisors (see below), whose sum is σ = 221513463153000. Its totient is φ = 220528958871424.

The previous prime is 221021211012191. The next prime is 221021211012247. The reversal of 221021211012211 is 112210112120122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221021211012211 - 2²³ = 221021202623603 is a prime.

It is a super-2 number, since 2×221021211012211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021211016211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246126069721 + ... + 246126070618.

It is an arithmetic number, because the mean of its divisors is an integer number (55378365788250).

Almost surely, 2^{221021211012211} is an apocalyptic number.

221021211012211 is a deficient number, since it is larger than the sum of its proper divisors (492252140789).

221021211012211 is an equidigital number, since it uses as much as digits as its factorization.

221021211012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492252140788.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221021211012211 its reverse (112210112120122), we get a palindrome (333231323132333).

The spelling of 221021211012211 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred eleven million, twelve thousand, two hundred eleven".