155234451321 has 64 divisors (see below), whose sum is σ = 244617719040. Its totient is φ = 96958218240.

The previous prime is 155234451299. The next prime is 155234451343. The reversal of 155234451321 is 123154432551.

155234451321 is a `hidden beast` number, since 1 + 55 + 234 + 4 + 51 + 321 = 666.

It is an interprime number because it is at equal distance from previous prime (155234451299) and next prime (155234451343).

It is not a de Polignac number, because 155234451321 - 2¹⁴ = 155234434937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155234451221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 134634681 + ... + 134635833.

It is an arithmetic number, because the mean of its divisors is an integer number (3822151860).

Almost surely, 2^155234451321 is an apocalyptic number.

It is an amenable number.

155234451321 is a deficient number, since it is larger than the sum of its proper divisors (89383267719).

155234451321 is a wasteful number, since it uses less digits than its factorization.

155234451321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2257 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

Adding to 155234451321 its reverse (123154432551), we get a palindrome (278388883872).

The spelling of 155234451321 in words is "one hundred fifty-five billion, two hundred thirty-four million, four hundred fifty-one thousand, three hundred twenty-one".