21533796 has 48 divisors (see below), whose sum is σ = 58262400. Its totient is φ = 6865056.

The previous prime is 21533791. The next prime is 21533807. The reversal of 21533796 is 69733512.

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 21533796.

It is not an unprimeable number, because it can be changed into a prime (21533791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1851 + ... + 6818.

It is an arithmetic number, because the mean of its divisors is an integer number (1213800).

Almost surely, 2^21533796 is an apocalyptic number.

It is an amenable number.

21533796 is an abundant number, since it is smaller than the sum of its proper divisors (36728604).

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

21533796 is a wasteful number, since it uses less digits than its factorization.

21533796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8705 (or 8697 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 21533796 is about 4640.4521331439. The cubic root of 21533796 is about 278.2105094311.

The spelling of 21533796 in words is "twenty-one million, five hundred thirty-three thousand, seven hundred ninety-six".