135621224 has 8 divisors (see below), whose sum is σ = 254289810. Its totient is φ = 67810608.

The previous prime is 135621217. The next prime is 135621247. The reversal of 135621224 is 422126531.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 88698724 + 46922500 = 9418^2 + 6850^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 135621193 and 135621202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8476319 + ... + 8476334.

Almost surely, 2^135621224 is an apocalyptic number.

It is an amenable number.

135621224 is a deficient number, since it is larger than the sum of its proper divisors (118668586).

135621224 is a wasteful number, since it uses less digits than its factorization.

135621224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16952659 (or 16952655 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 135621224 is about 11645.6525793963. The cubic root of 135621224 is about 513.7784527707.

Adding to 135621224 its reverse (422126531), we get a palindrome (557747755).

The spelling of 135621224 in words is "one hundred thirty-five million, six hundred twenty-one thousand, two hundred twenty-four".