158532021 has 24 divisors (see below), whose sum is σ = 242948160. Its totient is φ = 99271296.

The previous prime is 158531993. The next prime is 158532041. The reversal of 158532021 is 120235851.

It is a happy number.

It is not a de Polignac number, because 158532021 - 2⁹ = 158531509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158532041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125290 + ... + 126548.

It is an arithmetic number, because the mean of its divisors is an integer number (10122840).

Almost surely, 2^158532021 is an apocalyptic number.

It is an amenable number.

158532021 is a deficient number, since it is larger than the sum of its proper divisors (84416139).

158532021 is a wasteful number, since it uses less digits than its factorization.

158532021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105 (or 2102 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 158532021 is about 12590.9499641608. The cubic root of 158532021 is about 541.2181245907.

Adding to 158532021 its reverse (120235851), we get a palindrome (278767872).

The spelling of 158532021 in words is "one hundred fifty-eight million, five hundred thirty-two thousand, twenty-one".