21536496 has 40 divisors (see below), whose sum is σ = 61818960. Its totient is φ = 7178688.

The previous prime is 21536491. The next prime is 21536503. The reversal of 21536496 is 69463512.

It is a happy number.

21536496 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 649 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21536496.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21536491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24495 + ... + 25358.

It is an arithmetic number, because the mean of its divisors is an integer number (1545474).

Almost surely, 2^21536496 is an apocalyptic number.

It is an amenable number.

21536496 is an abundant number, since it is smaller than the sum of its proper divisors (40282464).

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

21536496 is a wasteful number, since it uses less digits than its factorization.

21536496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49870 (or 49858 counting only the distinct ones).

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

The square root of 21536496 is about 4640.7430439532. The cubic root of 21536496 is about 278.2221366887. Note that the first 3 decimals are identical.

It can be divided in two parts, 2153 and 6496, that added together give a square (8649 = 93²).

The spelling of 21536496 in words is "twenty-one million, five hundred thirty-six thousand, four hundred ninety-six".