155221436 has 6 divisors (see below), whose sum is σ = 271637520. Its totient is φ = 77610716.

The previous prime is 155221399. The next prime is 155221459. The reversal of 155221436 is 634122551.

155221436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 155221399 and 155221408.

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, 19402676 + ... + 19402683.

It is an arithmetic number, because the mean of its divisors is an integer number (45272920).

Almost surely, 2^155221436 is an apocalyptic number.

It is an amenable number.

155221436 is a deficient number, since it is larger than the sum of its proper divisors (116416084).

155221436 is a wasteful number, since it uses less digits than its factorization.

155221436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38805363 (or 38805361 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 155221436 is about 12458.7895078133. The cubic root of 155221436 is about 537.4242168982.

Adding to 155221436 its reverse (634122551), we get a palindrome (789343987).

The spelling of 155221436 in words is "one hundred fifty-five million, two hundred twenty-one thousand, four hundred thirty-six".