221142040 has 32 divisors (see below), whose sum is σ = 568651680. Its totient is φ = 75820032.

The previous prime is 221142029. The next prime is 221142041. The reversal of 221142040 is 40241122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221142041) 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 7 ways as a sum of consecutive naturals, for example, 394617 + ... + 395176.

It is an arithmetic number, because the mean of its divisors is an integer number (17770365).

Almost surely, 2^221142040 is an apocalyptic number.

221142040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221142040 is an abundant number, since it is smaller than the sum of its proper divisors (347509640).

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

221142040 is a wasteful number, since it uses less digits than its factorization.

221142040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789811 (or 789807 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221142040 is about 14870.8453021340. The cubic root of 221142040 is about 604.7238591357.

Adding to 221142040 its reverse (40241122), we get a palindrome (261383162).

The spelling of 221142040 in words is "two hundred twenty-one million, one hundred forty-two thousand, forty".