158680021 has 2 divisors, whose sum is σ = 158680022. Its totient is φ = 158680020.

The previous prime is 158680009. The next prime is 158680033. The reversal of 158680021 is 120086851.

It is a balanced prime because it is at equal distance from previous prime (158680009) and next prime (158680033).

It can be written as a sum of positive squares in only one way, i.e., 153412996 + 5267025 = 12386^2 + 2295^2 .

It is an emirp because it is prime and its reverse (120086851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158680021 - 2¹¹ = 158677973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158680051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79340010 + 79340011.

It is an arithmetic number, because the mean of its divisors is an integer number (79340011).

Almost surely, 2^158680021 is an apocalyptic number.

It is an amenable number.

158680021 is a deficient number, since it is larger than the sum of its proper divisors (1).

158680021 is an equidigital number, since it uses as much as digits as its factorization.

158680021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 158680021 is about 12596.8258303431. The cubic root of 158680021 is about 541.3864930346.

The spelling of 158680021 in words is "one hundred fifty-eight million, six hundred eighty thousand, twenty-one".