21160787 has 2 divisors, whose sum is σ = 21160788. Its totient is φ = 21160786.

The previous prime is 21160771. The next prime is 21160793. The reversal of 21160787 is 78706112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21160787 - 2⁴ = 21160771 is a prime.

It is not a weakly prime, because it can be changed into another prime (21160747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580393 + 10580394.

It is an arithmetic number, because the mean of its divisors is an integer number (10580394).

Almost surely, 2^21160787 is an apocalyptic number.

21160787 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160787 is an equidigital number, since it uses as much as digits as its factorization.

21160787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 21160787 is about 4600.0855426829. The cubic root of 21160787 is about 276.5947538133.

Adding to 21160787 its reverse (78706112), we get a palindrome (99866899).

The spelling of 21160787 in words is "twenty-one million, one hundred sixty thousand, seven hundred eighty-seven".