21136534 has 8 divisors (see below), whose sum is σ = 32798160. Its totient is φ = 10203816.

The previous prime is 21136523. The next prime is 21136541. The reversal of 21136534 is 43563112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21136499 and 21136508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182154 + ... + 182269.

It is an arithmetic number, because the mean of its divisors is an integer number (4099770).

Almost surely, 2^21136534 is an apocalyptic number.

21136534 is a deficient number, since it is larger than the sum of its proper divisors (11661626).

21136534 is a wasteful number, since it uses less digits than its factorization.

21136534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364454.

The product of its digits is 2160, while the sum is 25.

The square root of 21136534 is about 4597.4486402786. The cubic root of 21136534 is about 276.4890422907.

Adding to 21136534 its reverse (43563112), we get a palindrome (64699646).

The spelling of 21136534 in words is "twenty-one million, one hundred thirty-six thousand, five hundred thirty-four".