21346456 has 8 divisors (see below), whose sum is σ = 40024620. Its totient is φ = 10673224.

The previous prime is 21346453. The next prime is 21346459. The reversal of 21346456 is 65464312.

It is an interprime number because it is at equal distance from previous prime (21346453) and next prime (21346459).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346453) 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 as a sum of consecutive naturals, namely, 1334146 + ... + 1334161.

Almost surely, 2^21346456 is an apocalyptic number.

It is an amenable number.

21346456 is a deficient number, since it is larger than the sum of its proper divisors (18678164).

21346456 is a wasteful number, since it uses less digits than its factorization.

21346456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668313 (or 2668309 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 21346456 is about 4620.2225054644. Note that the first 3 decimals coincide. The cubic root of 21346456 is about 277.4013652646.

The spelling of 21346456 in words is "twenty-one million, three hundred forty-six thousand, four hundred fifty-six".