211221132231 has 4 divisors (see below), whose sum is σ = 281628176312. Its totient is φ = 140814088152.

The previous prime is 211221132229. The next prime is 211221132263. The reversal of 211221132231 is 132231122112.

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

It is not a de Polignac number, because 211221132231 - 2¹ = 211221132229 is a prime.

It is a super-2 number, since 2×211221132231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221132198 and 211221132207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220132231) 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, 35203522036 + ... + 35203522041.

It is an arithmetic number, because the mean of its divisors is an integer number (70407044078).

Almost surely, 2^211221132231 is an apocalyptic number.

211221132231 is a deficient number, since it is larger than the sum of its proper divisors (70407044081).

211221132231 is an equidigital number, since it uses as much as digits as its factorization.

211221132231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70407044080.

The product of its digits is 288, while the sum is 21.

Adding to 211221132231 its reverse (132231122112), we get a palindrome (343452254343).

The spelling of 211221132231 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred thirty-one".