155115530113421 has 2 divisors, whose sum is σ = 155115530113422. Its totient is φ = 155115530113420.

The previous prime is 155115530113367. The next prime is 155115530113429. The reversal of 155115530113421 is 124311035511551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152949367252900 + 2166162860521 = 12367270^2 + 1471789^2 .

It is a cyclic number.

It is not a de Polignac number, because 155115530113421 - 2¹⁰ = 155115530112397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155115530113429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77557765056710 + 77557765056711.

It is an arithmetic number, because the mean of its divisors is an integer number (77557765056711).

Almost surely, 2^{155115530113421} is an apocalyptic number.

It is an amenable number.

155115530113421 is a deficient number, since it is larger than the sum of its proper divisors (1).

155115530113421 is an equidigital number, since it uses as much as digits as its factorization.

155115530113421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 38.

Adding to 155115530113421 its reverse (124311035511551), we get a palindrome (279426565624972).

The spelling of 155115530113421 in words is "one hundred fifty-five trillion, one hundred fifteen billion, five hundred thirty million, one hundred thirteen thousand, four hundred twenty-one".