155531321211 has 48 divisors (see below), whose sum is σ = 248365483520. Its totient is φ = 84800580480.

The previous prime is 155531321173. The next prime is 155531321263. The reversal of 155531321211 is 112123135551.

It is not a de Polignac number, because 155531321211 - 2¹⁰ = 155531320187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155531321411) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4526466 + ... + 4560696.

Almost surely, 2^155531321211 is an apocalyptic number.

155531321211 is a deficient number, since it is larger than the sum of its proper divisors (92834162309).

155531321211 is a wasteful number, since it uses less digits than its factorization.

155531321211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34696 (or 34673 counting only the distinct ones).

The product of its digits is 4500, while the sum is 30.

Adding to 155531321211 its reverse (112123135551), we get a palindrome (267654456762).

The spelling of 155531321211 in words is "one hundred fifty-five billion, five hundred thirty-one million, three hundred twenty-one thousand, two hundred eleven".