155921120002 has 4 divisors (see below), whose sum is σ = 233881680006. Its totient is φ = 77960560000.

The previous prime is 155921119993. The next prime is 155921120011. The reversal of 155921120002 is 200021129551.

155921120002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 200021129551 = 197 ⋅1015335683.

It is an interprime number because it is at equal distance from previous prime (155921119993) and next prime (155921120011).

It can be written as a sum of positive squares in only one way, i.e., 102804238161 + 53116881841 = 320631^2 + 230471^2 .

It is a super-2 number, since 2×155921120002² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38980279999 + ... + 38980280002.

Almost surely, 2^155921120002 is an apocalyptic number.

155921120002 is a deficient number, since it is larger than the sum of its proper divisors (77960560004).

155921120002 is an equidigital number, since it uses as much as digits as its factorization.

155921120002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77960560003.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 155921120002 its reverse (200021129551), we get a palindrome (355942249553).

The spelling of 155921120002 in words is "one hundred fifty-five billion, nine hundred twenty-one million, one hundred twenty thousand, two".