221550142 has 16 divisors (see below), whose sum is σ = 371380464. Its totient is φ = 98248000.

The previous prime is 221550139. The next prime is 221550167. The reversal of 221550142 is 241055122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121909 + ... + 123712.

It is an arithmetic number, because the mean of its divisors is an integer number (23211279).

Almost surely, 2^221550142 is an apocalyptic number.

221550142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221550142 is a deficient number, since it is larger than the sum of its proper divisors (149830322).

221550142 is a wasteful number, since it uses less digits than its factorization.

221550142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245675.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 221550142 is about 14884.5605242479. The cubic root of 221550142 is about 605.0956222512.

The spelling of 221550142 in words is "two hundred twenty-one million, five hundred fifty thousand, one hundred forty-two".