158471021 has 2 divisors, whose sum is σ = 158471022. Its totient is φ = 158471020.

The previous prime is 158471017. The next prime is 158471041. The reversal of 158471021 is 120174851.

158471021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82537225 + 75933796 = 9085^2 + 8714^2 .

It is an emirp because it is prime and its reverse (120174851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158471021 - 2² = 158471017 is a prime.

It is a super-2 number, since 2×158471021² = 50226128993564882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158471011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79235510 + 79235511.

It is an arithmetic number, because the mean of its divisors is an integer number (79235511).

Almost surely, 2^158471021 is an apocalyptic number.

It is an amenable number.

158471021 is a deficient number, since it is larger than the sum of its proper divisors (1).

158471021 is an equidigital number, since it uses as much as digits as its factorization.

158471021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 158471021 is about 12588.5273562875. The cubic root of 158471021 is about 541.1486989930.

The spelling of 158471021 in words is "one hundred fifty-eight million, four hundred seventy-one thousand, twenty-one".