21337003 has 2 divisors, whose sum is σ = 21337004. Its totient is φ = 21337002.

The previous prime is 21336961. The next prime is 21337037. The reversal of 21337003 is 30073312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21337003 - 2²¹ = 19239851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21337093) 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, 10668501 + 10668502.

It is an arithmetic number, because the mean of its divisors is an integer number (10668502).

Almost surely, 2^21337003 is an apocalyptic number.

21337003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21337003 is an equidigital number, since it uses as much as digits as its factorization.

21337003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 19.

The square root of 21337003 is about 4619.1993895046. The cubic root of 21337003 is about 277.3604113582.

The spelling of 21337003 in words is "twenty-one million, three hundred thirty-seven thousand, three".