221557434 has 32 divisors (see below), whose sum is σ = 522756096. Its totient is φ = 61259760.

The previous prime is 221557411. The next prime is 221557451. The reversal of 221557434 is 434755122.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221557395 and 221557404.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83782 + ... + 86385.

It is an arithmetic number, because the mean of its divisors is an integer number (16336128).

Almost surely, 2^221557434 is an apocalyptic number.

221557434 is an abundant number, since it is smaller than the sum of its proper divisors (301198662).

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

221557434 is a wasteful number, since it uses less digits than its factorization.

221557434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170210.

The product of its digits is 33600, while the sum is 33.

The square root of 221557434 is about 14884.8054740396. The cubic root of 221557434 is about 605.1022607918.

The spelling of 221557434 in words is "two hundred twenty-one million, five hundred fifty-seven thousand, four hundred thirty-four".