21160457 has 2 divisors, whose sum is σ = 21160458. Its totient is φ = 21160456.

The previous prime is 21160439. The next prime is 21160501. The reversal of 21160457 is 75406112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14830201 + 6330256 = 3851^2 + 2516^2 .

It is a cyclic number.

It is not a de Polignac number, because 21160457 - 2²⁰ = 20111881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21160157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580228 + 10580229.

It is an arithmetic number, because the mean of its divisors is an integer number (10580229).

Almost surely, 2^21160457 is an apocalyptic number.

It is an amenable number.

21160457 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160457 is an equidigital number, since it uses as much as digits as its factorization.

21160457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21160457 is about 4600.0496736448. The cubic root of 21160457 is about 276.5933159848.

Adding to 21160457 its reverse (75406112), we get a palindrome (96566569).

The spelling of 21160457 in words is "twenty-one million, one hundred sixty thousand, four hundred fifty-seven".