21552041 has 8 divisors (see below), whose sum is σ = 24683904. Its totient is φ = 18433440.

The previous prime is 21552031. The next prime is 21552043. The reversal of 21552041 is 14025512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21552041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21552043) 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 7 ways as a sum of consecutive naturals, for example, 461 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (3085488).

Almost surely, 2^21552041 is an apocalyptic number.

It is an amenable number.

21552041 is a deficient number, since it is larger than the sum of its proper divisors (3131863).

21552041 is an equidigital number, since it uses as much as digits as its factorization.

21552041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6631.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 21552041 is about 4642.4175813901. The cubic root of 21552041 is about 278.2890606512.

Adding to 21552041 its reverse (14025512), we get a palindrome (35577553).

It can be divided in two parts, 215 and 52041, that multiplied together give a triangular number (11188815 = T₄₇₃₀).

The spelling of 21552041 in words is "twenty-one million, five hundred fifty-two thousand, forty-one".