21154708 has 12 divisors (see below), whose sum is σ = 37467360. Its totient is φ = 10449752.

The previous prime is 21154673. The next prime is 21154709. The reversal of 21154708 is 80745112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154709) 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, 31528 + ... + 32191.

It is an arithmetic number, because the mean of its divisors is an integer number (3122280).

Almost surely, 2^21154708 is an apocalyptic number.

It is an amenable number.

21154708 is a deficient number, since it is larger than the sum of its proper divisors (16312652).

21154708 is a wasteful number, since it uses less digits than its factorization.

21154708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63806 (or 63804 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 21154708 is about 4599.4247466395. The cubic root of 21154708 is about 276.5682648718.

The spelling of 21154708 in words is "twenty-one million, one hundred fifty-four thousand, seven hundred eight".