221221111022211 has 4 divisors (see below), whose sum is σ = 294961481362952. Its totient is φ = 147480740681472.

The previous prime is 221221111022167. The next prime is 221221111022213. The reversal of 221221111022211 is 112220111122122.

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

It is not a de Polignac number, because 221221111022211 - 2¹¹ = 221221111020163 is a prime.

It is a super-3 number, since 3×221221111022211³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221111022213) 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, 36870185170366 + ... + 36870185170371.

It is an arithmetic number, because the mean of its divisors is an integer number (73740370340738).

Almost surely, 2^{221221111022211} is an apocalyptic number.

221221111022211 is a deficient number, since it is larger than the sum of its proper divisors (73740370340741).

221221111022211 is an equidigital number, since it uses as much as digits as its factorization.

221221111022211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73740370340740.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221221111022211 its reverse (112220111122122), we get a palindrome (333441222144333).

The spelling of 221221111022211 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, twenty-two thousand, two hundred eleven".