21534844 has 12 divisors (see below), whose sum is σ = 37765000. Its totient is φ = 10744848.

The previous prime is 21534841. The next prime is 21534889. The reversal of 21534844 is 44843512.

It is a super-2 number, since 2×21534844² = 927499012208672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534841) 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 in 3 ways as a sum of consecutive naturals, for example, 3399 + ... + 7390.

Almost surely, 2^21534844 is an apocalyptic number.

It is an amenable number.

21534844 is a deficient number, since it is larger than the sum of its proper divisors (16230156).

21534844 is a wasteful number, since it uses less digits than its factorization.

21534844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11292 (or 11290 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

The square root of 21534844 is about 4640.5650518013. The cubic root of 21534844 is about 278.2150226450.

The spelling of 21534844 in words is "twenty-one million, five hundred thirty-four thousand, eight hundred forty-four".