21546396 has 36 divisors (see below), whose sum is σ = 55283592. Its totient is φ = 7074144.

The previous prime is 21546383. The next prime is 21546419. The reversal of 21546396 is 69364512.

It is a happy number.

21546396 is a `hidden beast` number, since 2 + 15 + 4 + 639 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 21546396.

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 in 11 ways as a sum of consecutive naturals, for example, 2055 + ... + 6878.

Almost surely, 2^21546396 is an apocalyptic number.

It is an amenable number.

21546396 is an abundant number, since it is smaller than the sum of its proper divisors (33737196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21546396 is a wasteful number, since it uses less digits than its factorization.

21546396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9010 (or 9005 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21546396 is about 4641.8095609363. The cubic root of 21546396 is about 278.2647616544.

The spelling of 21546396 in words is "twenty-one million, five hundred forty-six thousand, three hundred ninety-six".