221005434 has 16 divisors (see below), whose sum is σ = 476011872. Its totient is φ = 68001648.

The previous prime is 221005429. The next prime is 221005439. The reversal of 221005434 is 434500122.

221005434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221005429) and next prime (221005439).

It is a self number, because there is not a number n which added to its sum of digits gives 221005434.

It is not an unprimeable number, because it can be changed into a prime (221005439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416624 + ... + 1416779.

It is an arithmetic number, because the mean of its divisors is an integer number (29750742).

Almost surely, 2^221005434 is an apocalyptic number.

221005434 is an abundant number, since it is smaller than the sum of its proper divisors (255006438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221005434 is a wasteful number, since it uses less digits than its factorization.

221005434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833421.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221005434 is about 14866.2515113932. The cubic root of 221005434 is about 604.5993148634.

Adding to 221005434 its reverse (434500122), we get a palindrome (655505556).

The spelling of 221005434 in words is "two hundred twenty-one million, five thousand, four hundred thirty-four".