21160747 has 2 divisors, whose sum is σ = 21160748. Its totient is φ = 21160746.

The previous prime is 21160721. The next prime is 21160771. The reversal of 21160747 is 74706112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21160747 - 2²³ = 12772139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21160787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580373 + 10580374.

It is an arithmetic number, because the mean of its divisors is an integer number (10580374).

Almost surely, 2^21160747 is an apocalyptic number.

21160747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160747 is an equidigital number, since it uses as much as digits as its factorization.

21160747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21160747 is about 4600.0811949356. The cubic root of 21160747 is about 276.5945795318.

Adding to 21160747 its reverse (74706112), we get a palindrome (95866859).

The spelling of 21160747 in words is "twenty-one million, one hundred sixty thousand, seven hundred forty-seven".