155253312432121 has 4 divisors (see below), whose sum is σ = 159039978589044. Its totient is φ = 151466646275200.

The previous prime is 155253312432107. The next prime is 155253312432161. The reversal of 155253312432121 is 121234213352551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14830693932096 + 140422618500025 = 3851064^2 + 11850005^2 .

It is a cyclic number.

It is not a de Polignac number, because 155253312432121 - 2⁵ = 155253312432089 is a prime.

It is a super-2 number, since 2×155253312432121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155253312432161) 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, 1893333078400 + ... + 1893333078481.

It is an arithmetic number, because the mean of its divisors is an integer number (39759994647261).

Almost surely, 2^{155253312432121} is an apocalyptic number.

It is an amenable number.

155253312432121 is a deficient number, since it is larger than the sum of its proper divisors (3786666156923).

155253312432121 is an equidigital number, since it uses as much as digits as its factorization.

155253312432121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786666156922.

The product of its digits is 216000, while the sum is 40.

Adding to 155253312432121 its reverse (121234213352551), we get a palindrome (276487525784672).

The spelling of 155253312432121 in words is "one hundred fifty-five trillion, two hundred fifty-three billion, three hundred twelve million, four hundred thirty-two thousand, one hundred twenty-one".