155050401110021 has 4 divisors (see below), whose sum is σ = 155051860116000. Its totient is φ = 155048942104044.

The previous prime is 155050401109973. The next prime is 155050401110057. The reversal of 155050401110021 is 120011104050551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155050401110021 - 2⁶ = 155050401109957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155050401115021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729343571 + ... + 729556128.

It is an arithmetic number, because the mean of its divisors is an integer number (38762965029000).

Almost surely, 2^{155050401110021} is an apocalyptic number.

It is an amenable number.

155050401110021 is a deficient number, since it is larger than the sum of its proper divisors (1459005979).

155050401110021 is a wasteful number, since it uses less digits than its factorization.

155050401110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459005978.

The product of its (nonzero) digits is 1000, while the sum is 26.

Adding to 155050401110021 its reverse (120011104050551), we get a palindrome (275061505160572).

The spelling of 155050401110021 in words is "one hundred fifty-five trillion, fifty billion, four hundred one million, one hundred ten thousand, twenty-one".