152770021 has 4 divisors (see below), whose sum is σ = 153019852. Its totient is φ = 152520192.

The previous prime is 152769997. The next prime is 152770027. The reversal of 152770021 is 120077251.

It is a happy number.

152770021 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: 120077251 = 7 ⋅17153893.

It can be written as a sum of positive squares in 2 ways, for example, as 2217121 + 150552900 = 1489^2 + 12270^2 .

It is a cyclic number.

It is not a de Polignac number, because 152770021 - 2⁷ = 152769893 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 (152770027) 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, 123996 + ... + 125221.

It is an arithmetic number, because the mean of its divisors is an integer number (38254963).

Almost surely, 2^152770021 is an apocalyptic number.

It is an amenable number.

152770021 is a deficient number, since it is larger than the sum of its proper divisors (249831).

152770021 is an equidigital number, since it uses as much as digits as its factorization.

152770021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249830.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 152770021 is about 12360.0170307326. The cubic root of 152770021 is about 534.5800075258.

The spelling of 152770021 in words is "one hundred fifty-two million, seven hundred seventy thousand, twenty-one".