221211181270 has 16 divisors (see below), whose sum is σ = 398305911168. Its totient is φ = 88456520320.

The previous prime is 221211181253. The next prime is 221211181273. The reversal of 221211181270 is 72181112122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211181273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3460771 + ... + 3524110.

It is an arithmetic number, because the mean of its divisors is an integer number (24894119448).

Almost surely, 2^221211181270 is an apocalyptic number.

221211181270 is a deficient number, since it is larger than the sum of its proper divisors (177094729898).

221211181270 is a wasteful number, since it uses less digits than its factorization.

221211181270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6988055.

The product of its (nonzero) digits is 896, while the sum is 28.

Adding to 221211181270 its reverse (72181112122), we get a palindrome (293392293392).

The spelling of 221211181270 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred eighty-one thousand, two hundred seventy".