155150022121 has 4 divisors (see below), whose sum is σ = 158934169044. Its totient is φ = 151365875200.

The previous prime is 155150022067. The next prime is 155150022161. The reversal of 155150022121 is 121220051551.

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: 121220051551 = 47 ⋅2579150033.

It can be written as a sum of positive squares in 2 ways, for example, as 5544291600 + 149605730521 = 74460^2 + 386789^2 .

It is a cyclic number.

It is not a de Polignac number, because 155150022121 - 2¹⁷ = 155149891049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155150022161) 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, 1892073400 + ... + 1892073481.

It is an arithmetic number, because the mean of its divisors is an integer number (39733542261).

Almost surely, 2^155150022121 is an apocalyptic number.

It is an amenable number.

155150022121 is a deficient number, since it is larger than the sum of its proper divisors (3784146923).

155150022121 is an equidigital number, since it uses as much as digits as its factorization.

155150022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3784146922.

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 155150022121 its reverse (121220051551), we get a palindrome (276370073672).

The spelling of 155150022121 in words is "one hundred fifty-five billion, one hundred fifty million, twenty-two thousand, one hundred twenty-one".