221501434 has 32 divisors (see below), whose sum is σ = 424351872. Its totient is φ = 84192000.

The previous prime is 221501429. The next prime is 221501453. The reversal of 221501434 is 434105122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11227 + ... + 23854.

It is an arithmetic number, because the mean of its divisors is an integer number (13260996).

Almost surely, 2^221501434 is an apocalyptic number.

221501434 is a deficient number, since it is larger than the sum of its proper divisors (202850438).

221501434 is a wasteful number, since it uses less digits than its factorization.

221501434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35142.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 221501434 is about 14882.9242422314. The cubic root of 221501434 is about 605.0512753937.

Adding to 221501434 its reverse (434105122), we get a palindrome (655606556).

The spelling of 221501434 in words is "two hundred twenty-one million, five hundred one thousand, four hundred thirty-four".