142221505 has 4 divisors (see below), whose sum is σ = 170665812. Its totient is φ = 113777200.

The previous prime is 142221493. The next prime is 142221509. The reversal of 142221505 is 505122241.

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

It can be written as a sum of positive squares in 2 ways, for example, as 79352464 + 62869041 = 8908^2 + 7929^2 .

It is not a de Polignac number, because 142221505 - 2⁹ = 142220993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142221509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14222146 + ... + 14222155.

It is an arithmetic number, because the mean of its divisors is an integer number (42666453).

Almost surely, 2^142221505 is an apocalyptic number.

It is an amenable number.

142221505 is a deficient number, since it is larger than the sum of its proper divisors (28444307).

142221505 is an equidigital number, since it uses as much as digits as its factorization.

142221505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28444306.

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

The square root of 142221505 is about 11925.6658095051. The cubic root of 142221505 is about 521.9814747075.

Adding to 142221505 its reverse (505122241), we get a palindrome (647343746).

It can be divided in two parts, 1422 and 21505, that multiplied together give a triangular number (30580110 = T₇₈₂₀).

The spelling of 142221505 in words is "one hundred forty-two million, two hundred twenty-one thousand, five hundred five".