155340312321 has 16 divisors (see below), whose sum is σ = 208177789248. Its totient is φ = 103031880000.

The previous prime is 155340312319. The next prime is 155340312331. The reversal of 155340312321 is 123213043551.

It is not a de Polignac number, because 155340312321 - 2¹ = 155340312319 is a prime.

It is a super-2 number, since 2×155340312321² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155340312331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1752571 + ... + 1839071.

It is an arithmetic number, because the mean of its divisors is an integer number (13011111828).

Almost surely, 2^155340312321 is an apocalyptic number.

It is an amenable number.

155340312321 is a deficient number, since it is larger than the sum of its proper divisors (52837476927).

155340312321 is a wasteful number, since it uses less digits than its factorization.

155340312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89552.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 155340312321 its reverse (123213043551), we get a palindrome (278553355872).

The spelling of 155340312321 in words is "one hundred fifty-five billion, three hundred forty million, three hundred twelve thousand, three hundred twenty-one".