221430421243 has 32 divisors (see below), whose sum is σ = 242331264000. Its totient is φ = 201529480320.

The previous prime is 221430421211. The next prime is 221430421271. The reversal of 221430421243 is 342124034122.

It is a cyclic number.

It is not a de Polignac number, because 221430421243 - 2⁵ = 221430421211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221430421343) 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, 146544858 + ... + 146546368.

It is an arithmetic number, because the mean of its divisors is an integer number (7572852000).

Almost surely, 2^221430421243 is an apocalyptic number.

221430421243 is a deficient number, since it is larger than the sum of its proper divisors (20900842757).

221430421243 is a wasteful number, since it uses less digits than its factorization.

221430421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 221430421243 its reverse (342124034122), we get a palindrome (563554455365).

The spelling of 221430421243 in words is "two hundred twenty-one billion, four hundred thirty million, four hundred twenty-one thousand, two hundred forty-three".