157587021 has 6 divisors (see below), whose sum is σ = 227625710. Its totient is φ = 105058008.

The previous prime is 157586993. The next prime is 157587029. The reversal of 157587021 is 120785751.

157587021 is a `hidden beast` number, since 1 + 57 + 587 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 152250921 + 5336100 = 12339^2 + 2310^2 .

It is not a de Polignac number, because 157587021 - 2⁹ = 157586509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157587029) 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 5 ways as a sum of consecutive naturals, for example, 8754826 + ... + 8754843.

Almost surely, 2^157587021 is an apocalyptic number.

It is an amenable number.

157587021 is a deficient number, since it is larger than the sum of its proper divisors (70038689).

157587021 is a wasteful number, since it uses less digits than its factorization.

157587021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17509675 (or 17509672 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 157587021 is about 12553.3669188788. The cubic root of 157587021 is about 540.1405909655.

The spelling of 157587021 in words is "one hundred fifty-seven million, five hundred eighty-seven thousand, twenty-one".