155052050221 has 4 divisors (see below), whose sum is σ = 155073207744. Its totient is φ = 155030892700.

The previous prime is 155052050143. The next prime is 155052050227. The reversal of 155052050221 is 122050250551.

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 155052050221 - 2²⁷ = 154917832493 is a prime.

It is a super-3 number, since 3×155052050221³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155052050221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155052050227) 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, 10567765 + ... + 10582426.

It is an arithmetic number, because the mean of its divisors is an integer number (38768301936).

Almost surely, 2^155052050221 is an apocalyptic number.

It is an amenable number.

155052050221 is a deficient number, since it is larger than the sum of its proper divisors (21157523).

155052050221 is an equidigital number, since it uses as much as digits as its factorization.

155052050221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21157522.

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 155052050221 in words is "one hundred fifty-five billion, fifty-two million, fifty thousand, two hundred twenty-one".