221804142 has 32 divisors (see below), whose sum is σ = 514128384. Its totient is φ = 62479200.

The previous prime is 221804131. The next prime is 221804147. The reversal of 221804142 is 241408122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221804147) 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, 34209 + ... + 40172.

It is an arithmetic number, because the mean of its divisors is an integer number (16066512).

Almost surely, 2^221804142 is an apocalyptic number.

221804142 is an abundant number, since it is smaller than the sum of its proper divisors (292324242).

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

221804142 is a wasteful number, since it uses less digits than its factorization.

221804142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74464.

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 221804142 is about 14893.0904113283. The cubic root of 221804142 is about 605.3267747251.

The spelling of 221804142 in words is "two hundred twenty-one million, eight hundred four thousand, one hundred forty-two".