21754516 has 12 divisors (see below), whose sum is σ = 43509088. Its totient is φ = 9323352.

The previous prime is 21754507. The next prime is 21754519. The reversal of 21754516 is 61545712.

21754516 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21754519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388446 + ... + 388501.

Almost surely, 2^21754516 is an apocalyptic number.

It is an amenable number.

21754516 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21754516 is a wasteful number, since it uses less digits than its factorization.

21754516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776958 (or 776956 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 21754516 is about 4664.1736674356. The cubic root of 21754516 is about 279.1578266254.

The spelling of 21754516 in words is "twenty-one million, seven hundred fifty-four thousand, five hundred sixteen".