100142221 has 2 divisors, whose sum is σ = 100142222. Its totient is φ = 100142220.

The previous prime is 100142219. The next prime is 100142233. The reversal of 100142221 is 122241001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99400900 + 741321 = 9970^2 + 861^2 .

It is a cyclic number.

It is not a de Polignac number, because 100142221 - 2¹ = 100142219 is a prime.

Together with 100142219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100142321) 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 as a sum of consecutive naturals, namely, 50071110 + 50071111.

It is an arithmetic number, because the mean of its divisors is an integer number (50071111).

Almost surely, 2^100142221 is an apocalyptic number.

It is an amenable number.

100142221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100142221 is an equidigital number, since it uses as much as digits as its factorization.

100142221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 100142221 is about 10007.1085234447. The cubic root of 100142221 is about 464.3788229293.

Adding to 100142221 its reverse (122241001), we get a palindrome (222383222).

The spelling of 100142221 in words is "one hundred million, one hundred forty-two thousand, two hundred twenty-one".