211230031221 has 48 divisors (see below), whose sum is σ = 341500041792. Its totient is φ = 124700025600.

The previous prime is 211230031219. The next prime is 211230031247. The reversal of 211230031221 is 122130032112.

211230031221 is a `hidden beast` number, since 2 + 112 + 300 + 31 + 221 = 666.

It is not a de Polignac number, because 211230031221 - 2¹ = 211230031219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211230031194 and 211230031203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211230031291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2569471 + ... + 2650403.

It is an arithmetic number, because the mean of its divisors is an integer number (7114584204).

Almost surely, 2^211230031221 is an apocalyptic number.

It is an amenable number.

211230031221 is a deficient number, since it is larger than the sum of its proper divisors (130270010571).

211230031221 is a wasteful number, since it uses less digits than its factorization.

211230031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81634 (or 81631 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211230031221 its reverse (122130032112), we get a palindrome (333360063333).

The spelling of 211230031221 in words is "two hundred eleven billion, two hundred thirty million, thirty-one thousand, two hundred twenty-one".