155304255221 has 8 divisors (see below), whose sum is σ = 155884775904. Its totient is φ = 154723958640.

The previous prime is 155304255203. The next prime is 155304255247. The reversal of 155304255221 is 122552403551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155304255221 - 2¹⁰ = 155304254197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155004255221) 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, 1403291 + ... + 1509911.

It is an arithmetic number, because the mean of its divisors is an integer number (19485596988).

Almost surely, 2^155304255221 is an apocalyptic number.

It is an amenable number.

155304255221 is a deficient number, since it is larger than the sum of its proper divisors (580520683).

155304255221 is a wasteful number, since it uses less digits than its factorization.

155304255221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112051.

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 155304255221 its reverse (122552403551), we get a palindrome (277856658772).

The spelling of 155304255221 in words is "one hundred fifty-five billion, three hundred four million, two hundred fifty-five thousand, two hundred twenty-one".