211310232221 has 32 divisors (see below), whose sum is σ = 239706306048. Its totient is φ = 184597237440.

The previous prime is 211310232157. The next prime is 211310232233. The reversal of 211310232221 is 122232013112.

It is not a de Polignac number, because 211310232221 - 2⁶ = 211310232157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211310232193 and 211310232202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211310232251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27789206 + ... + 27796808.

It is an arithmetic number, because the mean of its divisors is an integer number (7490822064).

Almost surely, 2^211310232221 is an apocalyptic number.

It is an amenable number.

211310232221 is a deficient number, since it is larger than the sum of its proper divisors (28396073827).

211310232221 is a wasteful number, since it uses less digits than its factorization.

211310232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8601.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211310232221 its reverse (122232013112), we get a palindrome (333542245333).

The spelling of 211310232221 in words is "two hundred eleven billion, three hundred ten million, two hundred thirty-two thousand, two hundred twenty-one".