21465803 has 2 divisors, whose sum is σ = 21465804. Its totient is φ = 21465802.

The previous prime is 21465799. The next prime is 21465817. The reversal of 21465803 is 30856412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21465803 - 2² = 21465799 is a prime.

It is not a weakly prime, because it can be changed into another prime (21465823) 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, 10732901 + 10732902.

It is an arithmetic number, because the mean of its divisors is an integer number (10732902).

Almost surely, 2^21465803 is an apocalyptic number.

21465803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21465803 is an equidigital number, since it uses as much as digits as its factorization.

21465803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21465803 is about 4633.1202229167. The cubic root of 21465803 is about 277.9173839698.

The spelling of 21465803 in words is "twenty-one million, four hundred sixty-five thousand, eight hundred three".