21553041 has 12 divisors (see below), whose sum is σ = 29095952. Its totient is φ = 14191584.

The previous prime is 21553039. The next prime is 21553057. The reversal of 21553041 is 14035512.

It is not a de Polignac number, because 21553041 - 2¹ = 21553039 is a prime.

It is a super-3 number, since 3×21553041³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21552999 and 21553017.

It is not an unprimeable number, because it can be changed into a prime (21553141) 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 11 ways as a sum of consecutive naturals, for example, 23310 + ... + 24216.

Almost surely, 2^21553041 is an apocalyptic number.

It is an amenable number.

21553041 is a deficient number, since it is larger than the sum of its proper divisors (7542911).

21553041 is an frugal number, since it uses more digits than its factorization.

21553041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 999 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21553041 is about 4642.5252826452. The cubic root of 21553041 is about 278.2933647255.

Adding to 21553041 its reverse (14035512), we get a palindrome (35588553).

The spelling of 21553041 in words is "twenty-one million, five hundred fifty-three thousand, forty-one".