21463347 has 16 divisors (see below), whose sum is σ = 30032640. Its totient is φ = 13608672.

The previous prime is 21463339. The next prime is 21463363. The reversal of 21463347 is 74336412.

It is not a de Polignac number, because 21463347 - 2³ = 21463339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21463327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12804 + ... + 14382.

It is an arithmetic number, because the mean of its divisors is an integer number (1877040).

Almost surely, 2^21463347 is an apocalyptic number.

21463347 is a deficient number, since it is larger than the sum of its proper divisors (8569293).

21463347 is a wasteful number, since it uses less digits than its factorization.

21463347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802.

The product of its digits is 12096, while the sum is 30.

The square root of 21463347 is about 4632.8551671728. The cubic root of 21463347 is about 277.9067843022.

Adding to 21463347 its reverse (74336412), we get a palindrome (95799759).

The spelling of 21463347 in words is "twenty-one million, four hundred sixty-three thousand, three hundred forty-seven".