211444231221 has 16 divisors (see below), whose sum is σ = 313286875200. Its totient is φ = 140946547824.

The previous prime is 211444231177. The next prime is 211444231249. The reversal of 211444231221 is 122132444112.

211444231221 is a `hidden beast` number, since 2 + 1 + 14 + 4 + 423 + 1 + 221 = 666.

It is not a de Polignac number, because 211444231221 - 2⁶ = 211444231157 is a prime.

It is a super-2 number, since 2×211444231221² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211444231291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211486 + ... + 683823.

It is an arithmetic number, because the mean of its divisors is an integer number (19580429700).

Almost surely, 2^211444231221 is an apocalyptic number.

It is an amenable number.

211444231221 is a deficient number, since it is larger than the sum of its proper divisors (101842643979).

211444231221 is an equidigital number, since it uses as much as digits as its factorization.

211444231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904065 (or 904059 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 211444231221 its reverse (122132444112), we get a palindrome (333576675333).

The spelling of 211444231221 in words is "two hundred eleven billion, four hundred forty-four million, two hundred thirty-one thousand, two hundred twenty-one".