21160157 has 2 divisors, whose sum is σ = 21160158. Its totient is φ = 21160156.

The previous prime is 21160151. The next prime is 21160159. The reversal of 21160157 is 75106112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16048036 + 5112121 = 4006^2 + 2261^2 .

It is a cyclic number.

It is not a de Polignac number, because 21160157 - 2¹⁰ = 21159133 is a prime.

Together with 21160159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21160151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580078 + 10580079.

It is an arithmetic number, because the mean of its divisors is an integer number (10580079).

Almost surely, 2^21160157 is an apocalyptic number.

It is an amenable number.

21160157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160157 is an equidigital number, since it uses as much as digits as its factorization.

21160157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 21160157 is about 4600.0170651857. The cubic root of 21160157 is about 276.5920088551.

Adding to 21160157 its reverse (75106112), we get a palindrome (96266269).

The spelling of 21160157 in words is "twenty-one million, one hundred sixty thousand, one hundred fifty-seven".