21127159 has 2 divisors, whose sum is σ = 21127160. Its totient is φ = 21127158.

The previous prime is 21127121. The next prime is 21127193. The reversal of 21127159 is 95172112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21127159 - 2¹⁵ = 21094391 is a prime.

It is a super-2 number, since 2×21127159² = 892713694822562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21127459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563579 + 10563580.

It is an arithmetic number, because the mean of its divisors is an integer number (10563580).

Almost surely, 2^21127159 is an apocalyptic number.

21127159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21127159 is an equidigital number, since it uses as much as digits as its factorization.

21127159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 28.

The square root of 21127159 is about 4596.4289399489. The cubic root of 21127159 is about 276.4481578186.

The spelling of 21127159 in words is "twenty-one million, one hundred twenty-seven thousand, one hundred fifty-nine".