155033321213 has 4 divisors (see below), whose sum is σ = 155698700508. Its totient is φ = 154367941920.

The previous prime is 155033321207. The next prime is 155033321237. The reversal of 155033321213 is 312123330551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312123330551 = 269 ⋅1160309779.

It can be written as a sum of positive squares in 2 ways, for example, as 81246661444 + 73786659769 = 285038^2 + 271637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155033321213 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 (155033321713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332689298 + ... + 332689763.

It is an arithmetic number, because the mean of its divisors is an integer number (38924675127).

Almost surely, 2^155033321213 is an apocalyptic number.

It is an amenable number.

155033321213 is a deficient number, since it is larger than the sum of its proper divisors (665379295).

155033321213 is an equidigital number, since it uses as much as digits as its factorization.

155033321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665379294.

The product of its (nonzero) digits is 8100, while the sum is 29.

Adding to 155033321213 its reverse (312123330551), we get a palindrome (467156651764).

The spelling of 155033321213 in words is "one hundred fifty-five billion, thirty-three million, three hundred twenty-one thousand, two hundred thirteen".