221451442 has 8 divisors (see below), whose sum is σ = 335402496. Its totient is φ = 109650612.

The previous prime is 221451431. The next prime is 221451449. The reversal of 221451442 is 244154122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221451449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537298 + ... + 537709.

It is an arithmetic number, because the mean of its divisors is an integer number (41925312).

Almost surely, 2^221451442 is an apocalyptic number.

221451442 is a deficient number, since it is larger than the sum of its proper divisors (113951054).

221451442 is a wasteful number, since it uses less digits than its factorization.

221451442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075112.

The product of its digits is 2560, while the sum is 25.

The square root of 221451442 is about 14881.2446388063. The cubic root of 221451442 is about 605.0057527400.

The spelling of 221451442 in words is "two hundred twenty-one million, four hundred fifty-one thousand, four hundred forty-two".