21754330 has 16 divisors (see below), whose sum is σ = 42170184. Its totient is φ = 8032320.

The previous prime is 21754307. The next prime is 21754351. The reversal of 21754330 is 3345712.

It can be written as a sum of positive squares in 4 ways, for example, as 10751841 + 11002489 = 3279^2 + 3317^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21754295 and 21754304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83541 + ... + 83800.

Almost surely, 2^21754330 is an apocalyptic number.

21754330 is a deficient number, since it is larger than the sum of its proper divisors (20415854).

21754330 is a wasteful number, since it uses less digits than its factorization.

21754330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167361.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 21754330 is about 4664.1537281698. The cubic root of 21754330 is about 279.1570310280.

The spelling of 21754330 in words is "twenty-one million, seven hundred fifty-four thousand, three hundred thirty".