21146456 has 8 divisors (see below), whose sum is σ = 39649620. Its totient is φ = 10573224.

The previous prime is 21146399. The next prime is 21146501. The reversal of 21146456 is 65464112.

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

It is a congruent number.

It is an unprimeable number.

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, 1321646 + ... + 1321661.

Almost surely, 2^21146456 is an apocalyptic number.

It is an amenable number.

21146456 is a deficient number, since it is larger than the sum of its proper divisors (18503164).

21146456 is a wasteful number, since it uses less digits than its factorization.

21146456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643313 (or 2643309 counting only the distinct ones).

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

The square root of 21146456 is about 4598.5275904359. The cubic root of 21146456 is about 276.5322990695.

The spelling of 21146456 in words is "twenty-one million, one hundred forty-six thousand, four hundred fifty-six".