21160577 has 2 divisors, whose sum is σ = 21160578. Its totient is φ = 21160576.

The previous prime is 21160571. The next prime is 21160591. The reversal of 21160577 is 77506112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 4177936 = 4121^2 + 2044^2 .

It is a cyclic number.

It is not a de Polignac number, because 21160577 - 2²² = 16966273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21160571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580288 + 10580289.

It is an arithmetic number, because the mean of its divisors is an integer number (10580289).

Almost surely, 2^21160577 is an apocalyptic number.

It is an amenable number.

21160577 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160577 is an equidigital number, since it uses as much as digits as its factorization.

21160577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 21160577 is about 4600.0627169638. The cubic root of 21160577 is about 276.5938388333.

Adding to 21160577 its reverse (77506112), we get a palindrome (98666689).

The spelling of 21160577 in words is "twenty-one million, one hundred sixty thousand, five hundred seventy-seven".