221001142 has 4 divisors (see below), whose sum is σ = 331501716. Its totient is φ = 110500570.

The previous prime is 221001133. The next prime is 221001163. The reversal of 221001142 is 241100122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55250284 + ... + 55250287.

It is an arithmetic number, because the mean of its divisors is an integer number (82875429).

Almost surely, 2^221001142 is an apocalyptic number.

221001142 is a deficient number, since it is larger than the sum of its proper divisors (110500574).

221001142 is a wasteful number, since it uses less digits than its factorization.

221001142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110500573.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221001142 is about 14866.1071568854. The cubic root of 221001142 is about 604.5954009973.

Adding to 221001142 its reverse (241100122), we get a palindrome (462101264).

The spelling of 221001142 in words is "two hundred twenty-one million, one thousand, one hundred forty-two".