21294001 has 2 divisors, whose sum is σ = 21294002. Its totient is φ = 21294000.

The previous prime is 21293989. The next prime is 21294029. The reversal of 21294001 is 10049212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18054001 + 3240000 = 4249^2 + 1800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21294001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21294001.

It is not a weakly prime, because it can be changed into another prime (21294101) 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, 10647000 + 10647001.

It is an arithmetic number, because the mean of its divisors is an integer number (10647001).

Almost surely, 2^21294001 is an apocalyptic number.

It is an amenable number.

21294001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21294001 is an equidigital number, since it uses as much as digits as its factorization.

21294001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21294001 is about 4614.5423391708. The cubic root of 21294001 is about 277.1739579018.

The spelling of 21294001 in words is "twenty-one million, two hundred ninety-four thousand, one".