21041755 has 8 divisors (see below), whose sum is σ = 28857312. Its totient is φ = 14428608.

The previous prime is 21041747. The next prime is 21041771. The reversal of 21041755 is 55714012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21041755 - 2³ = 21041747 is a prime.

It is a Duffinian number.

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, 300562 + ... + 300631.

It is an arithmetic number, because the mean of its divisors is an integer number (3607164).

Almost surely, 2^21041755 is an apocalyptic number.

21041755 is a deficient number, since it is larger than the sum of its proper divisors (7815557).

21041755 is an equidigital number, since it uses as much as digits as its factorization.

21041755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601205.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 21041755 is about 4587.1292765737. The cubic root of 21041755 is about 276.0751519428.

Adding to 21041755 its reverse (55714012), we get a palindrome (76755767).

The spelling of 21041755 in words is "twenty-one million, forty-one thousand, seven hundred fifty-five".