21534053 has 8 divisors (see below), whose sum is σ = 22861440. Its totient is φ = 20213440.

The previous prime is 21534047. The next prime is 21534067. The reversal of 21534053 is 35043512.

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 21534053 - 2¹² = 21529957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5858 + ... + 8796.

It is an arithmetic number, because the mean of its divisors is an integer number (2857680).

Almost surely, 2^21534053 is an apocalyptic number.

It is an amenable number.

21534053 is a deficient number, since it is larger than the sum of its proper divisors (1327387).

21534053 is a wasteful number, since it uses less digits than its factorization.

21534053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21534053 is about 4640.4798243285. The cubic root of 21534053 is about 278.2116162156.

Adding to 21534053 its reverse (35043512), we get a palindrome (56577565).

It can be divided in two parts, 2153405 and 3, that multiplied together give a triangular number (6460215 = T₃₅₉₄).

The spelling of 21534053 in words is "twenty-one million, five hundred thirty-four thousand, fifty-three".