155253221 has 8 divisors (see below), whose sum is σ = 159609120. Its totient is φ = 150905808.

The previous prime is 155253191. The next prime is 155253227. The reversal of 155253221 is 122352551.

155253221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 155253221 - 2⁶ = 155253157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155253227) 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, 58910 + ... + 61488.

It is an arithmetic number, because the mean of its divisors is an integer number (19951140).

Almost surely, 2^155253221 is an apocalyptic number.

It is an amenable number.

155253221 is a deficient number, since it is larger than the sum of its proper divisors (4355899).

155253221 is a wasteful number, since it uses less digits than its factorization.

155253221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243.

The product of its digits is 3000, while the sum is 26.

The square root of 155253221 is about 12460.0650479843. The cubic root of 155253221 is about 537.4608975340.

The spelling of 155253221 in words is "one hundred fifty-five million, two hundred fifty-three thousand, two hundred twenty-one".