221434243231 has 4 divisors (see below), whose sum is σ = 221516289000. Its totient is φ = 221352197464.

The previous prime is 221434243201. The next prime is 221434243279. The reversal of 221434243231 is 132342434122.

221434243231 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 not a de Polignac number, because 221434243231 - 2⁹ = 221434242719 is a prime.

It is a super-2 number, since 2×221434243231² (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 = 221434243193 and 221434243202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221434243201) 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, 41018836 + ... + 41024233.

It is an arithmetic number, because the mean of its divisors is an integer number (55379072250).

Almost surely, 2^221434243231 is an apocalyptic number.

221434243231 is a deficient number, since it is larger than the sum of its proper divisors (82045769).

221434243231 is an equidigital number, since it uses as much as digits as its factorization.

221434243231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82045768.

The product of its digits is 27648, while the sum is 31.

Adding to 221434243231 its reverse (132342434122), we get a palindrome (353776677353).

The spelling of 221434243231 in words is "two hundred twenty-one billion, four hundred thirty-four million, two hundred forty-three thousand, two hundred thirty-one".