221340434 has 32 divisors (see below), whose sum is σ = 393609216. Its totient is φ = 91348560.

The previous prime is 221340409. The next prime is 221340439. The reversal of 221340434 is 434043122.

It is not an unprimeable number, because it can be changed into a prime (221340439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95639 + ... + 97925.

It is an arithmetic number, because the mean of its divisors is an integer number (12300288).

Almost surely, 2^221340434 is an apocalyptic number.

221340434 is a deficient number, since it is larger than the sum of its proper divisors (172268782).

221340434 is a wasteful number, since it uses less digits than its factorization.

221340434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 221340434 is about 14877.5143757282. The cubic root of 221340434 is about 604.9046444894.

Adding to 221340434 its reverse (434043122), we get a palindrome (655383556).

The spelling of 221340434 in words is "two hundred twenty-one million, three hundred forty thousand, four hundred thirty-four".