155002541221 has 8 divisors (see below), whose sum is σ = 169096629600. Its totient is φ = 140908944240.

The previous prime is 155002541201. The next prime is 155002541263. The reversal of 155002541221 is 122145200551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155002541221 - 2⁵ = 155002541189 is a prime.

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 155002541221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155002541201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926290 + ... + 1080748.

It is an arithmetic number, because the mean of its divisors is an integer number (21137078700).

Almost surely, 2^155002541221 is an apocalyptic number.

155002541221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155002541221 is a deficient number, since it is larger than the sum of its proper divisors (14094088379).

155002541221 is a wasteful number, since it uses less digits than its factorization.

155002541221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245699.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 155002541221 its reverse (122145200551), we get a palindrome (277147741772).

The spelling of 155002541221 in words is "one hundred fifty-five billion, two million, five hundred forty-one thousand, two hundred twenty-one".