221331023 has 4 divisors (see below), whose sum is σ = 221362008. Its totient is φ = 221300040.

The previous prime is 221331013. The next prime is 221331029. The reversal of 221331023 is 320133122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221331023 - 2¹⁸ = 221068879 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221330992 and 221331010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221331029) 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, 1265 + ... + 21077.

It is an arithmetic number, because the mean of its divisors is an integer number (55340502).

Almost surely, 2^221331023 is an apocalyptic number.

221331023 is a deficient number, since it is larger than the sum of its proper divisors (30985).

221331023 is a wasteful number, since it uses less digits than its factorization.

221331023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30984.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 221331023 is about 14877.1980896942. The cubic root of 221331023 is about 604.8960712128.

Adding to 221331023 its reverse (320133122), we get a palindrome (541464145).

The spelling of 221331023 in words is "two hundred twenty-one million, three hundred thirty-one thousand, twenty-three".