21067349 has 2 divisors, whose sum is σ = 21067350. Its totient is φ = 21067348.

The previous prime is 21067331. The next prime is 21067357. The reversal of 21067349 is 94376012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19298449 + 1768900 = 4393^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 21067349 - 2¹² = 21063253 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21061349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10533674 + 10533675.

It is an arithmetic number, because the mean of its divisors is an integer number (10533675).

Almost surely, 2^21067349 is an apocalyptic number.

It is an amenable number.

21067349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21067349 is an equidigital number, since it uses as much as digits as its factorization.

21067349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21067349 is about 4589.9181909921. The cubic root of 21067349 is about 276.1870406538.

The spelling of 21067349 in words is "twenty-one million, sixty-seven thousand, three hundred forty-nine".