21316741 has 2 divisors, whose sum is σ = 21316742. Its totient is φ = 21316740.

The previous prime is 21316739. The next prime is 21316751. The reversal of 21316741 is 14761312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13912900 + 7403841 = 3730^2 + 2721^2 .

It is a cyclic number.

It is not a de Polignac number, because 21316741 - 2¹ = 21316739 is a prime.

It is a super-2 number, since 2×21316741² = 908806893722162, which contains 22 as substring.

Together with 21316739, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21316721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10658370 + 10658371.

It is an arithmetic number, because the mean of its divisors is an integer number (10658371).

Almost surely, 2^21316741 is an apocalyptic number.

It is an amenable number.

21316741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21316741 is an equidigital number, since it uses as much as digits as its factorization.

21316741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 21316741 is about 4617.0056313589. The cubic root of 21316741 is about 277.2725880823.

The spelling of 21316741 in words is "twenty-one million, three hundred sixteen thousand, seven hundred forty-one".