321242155 has 16 divisors (see below), whose sum is σ = 416886624. Its totient is φ = 236229120.

The previous prime is 321242123. The next prime is 321242179. The reversal of 321242155 is 551242123.

It is not a de Polignac number, because 321242155 - 2⁵ = 321242123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5412 + ... + 25918.

It is an arithmetic number, because the mean of its divisors is an integer number (26055414).

Almost surely, 2^321242155 is an apocalyptic number.

321242155 is a deficient number, since it is larger than the sum of its proper divisors (95644469).

321242155 is a wasteful number, since it uses less digits than its factorization.

321242155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20766.

The product of its digits is 2400, while the sum is 25.

The square root of 321242155 is about 17923.2294802025. The cubic root of 321242155 is about 684.8742589808.

Adding to 321242155 its reverse (551242123), we get a palindrome (872484278).

The spelling of 321242155 in words is "three hundred twenty-one million, two hundred forty-two thousand, one hundred fifty-five".