142221626 has 16 divisors (see below), whose sum is σ = 233672040. Its totient is φ = 64619520.

The previous prime is 142221623. The next prime is 142221689. The reversal of 142221626 is 626122241.

It can be written as a sum of positive squares in 4 ways, for example, as 138415225 + 3806401 = 11765^2 + 1951^2 .

It is a junction number, because it is equal to n+sod(n) for n = 142221595 and 142221604.

It is not an unprimeable number, because it can be changed into a prime (142221623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71135 + ... + 73106.

Almost surely, 2^142221626 is an apocalyptic number.

142221626 is a deficient number, since it is larger than the sum of its proper divisors (91450414).

142221626 is a wasteful number, since it uses less digits than its factorization.

142221626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144289.

The product of its digits is 2304, while the sum is 26.

The square root of 142221626 is about 11925.6708825961. The cubic root of 142221626 is about 521.9816227389.

Adding to 142221626 its reverse (626122241), we get a palindrome (768343867).

The spelling of 142221626 in words is "one hundred forty-two million, two hundred twenty-one thousand, six hundred twenty-six".