153155021 has 4 divisors (see below), whose sum is σ = 153274044. Its totient is φ = 153036000.

The previous prime is 153154993. The next prime is 153155033. The reversal of 153155021 is 120551351.

It is a happy number.

153155021 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: 120551351 = 157 ⋅767843.

It can be written as a sum of positive squares in 2 ways, for example, as 22944100 + 130210921 = 4790^2 + 11411^2 .

It is a cyclic number.

It is not a de Polignac number, because 153155021 - 2¹⁰ = 153153997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153155081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57560 + ... + 60161.

It is an arithmetic number, because the mean of its divisors is an integer number (38318511).

Almost surely, 2^153155021 is an apocalyptic number.

It is an amenable number.

153155021 is a deficient number, since it is larger than the sum of its proper divisors (119023).

153155021 is a wasteful number, since it uses less digits than its factorization.

153155021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119022.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 153155021 is about 12375.5816428966. The cubic root of 153155021 is about 535.0287008215.

The spelling of 153155021 in words is "one hundred fifty-three million, one hundred fifty-five thousand, twenty-one".