21352534 has 24 divisors (see below), whose sum is σ = 37970208. Its totient is φ = 8976240.

The previous prime is 21352531. The next prime is 21352543. The reversal of 21352534 is 43525312.

It is a junction number, because it is equal to n+sod(n) for n = 21352499 and 21352508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352531) 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 11 ways as a sum of consecutive naturals, for example, 3139 + ... + 7249.

It is an arithmetic number, because the mean of its divisors is an integer number (1582092).

Almost surely, 2^21352534 is an apocalyptic number.

21352534 is a deficient number, since it is larger than the sum of its proper divisors (16617674).

21352534 is a wasteful number, since it uses less digits than its factorization.

21352534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180 (or 4173 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 21352534 is about 4620.8802191790. The cubic root of 21352534 is about 277.4276910319.

Adding to 21352534 its reverse (43525312), we get a palindrome (64877846).

The spelling of 21352534 in words is "twenty-one million, three hundred fifty-two thousand, five hundred thirty-four".