221132212331 has 4 divisors (see below), whose sum is σ = 221213904072. Its totient is φ = 221050520592.

The previous prime is 221132212309. The next prime is 221132212339. The reversal of 221132212331 is 133212231122.

221132212331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221132212331 is a prime.

It is a super-2 number, since 2×221132212331² (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 = 221132212297 and 221132212306.

It is not an unprimeable number, because it can be changed into a prime (221132212339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40841810 + ... + 40847223.

It is an arithmetic number, because the mean of its divisors is an integer number (55303476018).

Almost surely, 2^221132212331 is an apocalyptic number.

221132212331 is a deficient number, since it is larger than the sum of its proper divisors (81691741).

221132212331 is an equidigital number, since it uses as much as digits as its factorization.

221132212331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81691740.

The product of its digits is 864, while the sum is 23.

Adding to 221132212331 its reverse (133212231122), we get a palindrome (354344443453).

The spelling of 221132212331 in words is "two hundred twenty-one billion, one hundred thirty-two million, two hundred twelve thousand, three hundred thirty-one".