21337061 has 2 divisors, whose sum is σ = 21337062. Its totient is φ = 21337060.

The previous prime is 21337037. The next prime is 21337081. The reversal of 21337061 is 16073312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13322500 + 8014561 = 3650^2 + 2831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21337061 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 (21337081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668530 + 10668531.

It is an arithmetic number, because the mean of its divisors is an integer number (10668531).

Almost surely, 2^21337061 is an apocalyptic number.

It is an amenable number.

21337061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21337061 is an equidigital number, since it uses as much as digits as its factorization.

21337061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 21337061 is about 4619.2056676446. The cubic root of 21337061 is about 277.3606626727.

The spelling of 21337061 in words is "twenty-one million, three hundred thirty-seven thousand, sixty-one".